Bar Muscle-Up & Negative: Evidence-Based Progression and Tempo Prescription

The muscle-up has the thinnest peer-reviewed evidence base of any exercise in this cluster, thinner than deadlift, thinner than pull-up. Zero tempo RCTs, one direct EMG study with ten subjects, and zero kinematic segmentation of the transition phase. That reality requires the most aggressive skeptical framing on this page. The prescriptions below sit inside the strongest meta-analytic evidence we have on related exercises and movements, anchored on Nuzzo 2023, Roig 2009, and Schoenfeld 2015; everything specific to the muscle-up is flagged as inference or coaching consensus.

• Negative-only muscle-up is the single most evidence-defensible progression tool on the page. Standard prescription: 5-8 second eccentric, 3-5 reps × 3 sets, twice weekly. Anchored on Nuzzo et al. (2023) meta-analytic eccentric-to-concentric strength ratio of 1.41, paired with Roig et al. (2009) and Schoenfeld et al. (2017) on contraction-mode adaptation. No direct muscle-up RCT exists.
• Strict bar muscle-up tempo defaults to 3-0-X-0; transition-skill work uses 3-2-X-0 with a two-second pause at chest-clear position. Bounded above by the Schoenfeld, Ogborn and Krieger (2015) eight-second equivalence ceiling and supported by Wilk, Zajác and Tufano (2021).
• Critical evidence gap: the only direct muscle-up paper is Walker et al. (2023), a descriptive EMG comparison of bar versus ring muscle-up in ten active males. It collapses pull and push into two bins and does not segment the transition phase. Practitioner authority (Steven Low's Overcoming Gravity, Coach Sommer's gymnastic methodology) carries the protocol specifics. Flagged explicitly throughout this page.

Why the bar muscle-up and its negative deserve their own page

The bar muscle-up is mechanically a three-phase event: a high pull that brings the chest above the bar, a transition that rotates the shoulder around and over the bar, and a dip that locks the body out in support position. The three phases load fundamentally different muscle systems and fail at different positions. A page that treats the muscle-up as "a hard pull-up" misses what actually makes the lift difficult.

Walker, Bruenger, Tucker and Lee (2023) published the only direct peer-reviewed EMG comparison of the bar muscle-up against the ring muscle-up. The study measured surface EMG across major contributors in ten active males during a single session. The authors described the movement in their introduction: the latissimus dorsi and biceps brachii are primary during the pull phase; the triceps brachii and pectoralis major are primary during the dip phase; the upper trapezius, lower trapezius, and serratus anterior stabilize the scapula throughout. Ring muscle-up activation was significantly higher than bar muscle-up for upper trapezius, biceps brachii, and forearm flexors in the pull phase, and for triceps brachii and biceps brachii in the push phase. Their conclusion: "the BMU may be a better technique to learn first due to its lower difficulty."

Critical caveat that must be stated up front: Walker et al. (2023) collapsed all activity below the bar/rings-at-chest position into a single "pull" bin and all activity above it into a single "push" bin. No study segments the transition phase separately. The single most biomechanically interesting moment in the lift, the rotation of the shoulder from peak humeral flexion through internal rotation into the support position, has zero peer-reviewed kinematic or EMG decomposition. Every claim on this page about the transition is either coaching consensus or inference from adjacent literature.

The pull-height question has stronger empirical anchors. Dinunzio et al. (2019) measured kinematics and EMG across strict and kipping pull-ups in eleven CrossFit-experienced males. Kipping significantly increased maximum hip angle by 48.8 ± 6.8 degrees (p < 0.001) and maximum knee angle by 56.5 ± 11.3 degrees (p < 0.001), while latissimus dorsi, biceps brachii, infraspinatus, and pectoralis major activation decreased compared to strict. This is the quantitative basis for the practitioner claim that kipping recruits the lower-body kinetic chain at the expense of upper-body strength. By inference, the strict bar muscle-up inherits the strict-pull EMG profile but demands a substantially higher pull than chest-to-bar, the chest must clear the bar by the height of the upper arm to allow the transition.

The transition position carries the humerus through peak forward flexion with the scapula in significant upward rotation and protraction. Prinold and Bull (2016) measured scapular kinematics across pull-up techniques in eleven trained subjects and stated bluntly that "high arm elevation during pull-ups reduces sub-acromial space and increases pressure, increasing the risk of impingement injury." Wide-grip and reverse pull-up variants showed kinematic patterns linked to elevated impingement risk. The application to the muscle-up is analogous, not direct: the transition position loads the shoulder at the most mechanically disadvantaged angle in the lift. This is the strongest available evidence for why progressive loading of the transition matters, but it is biomechanical inference, not a muscle-up training trial. Tempo notation across the prescriptions below uses Charles Poliquin's four-digit convention; for the conceptual background see the four-phase tempo notation guide.

Bar muscle-up tempo prescriptions

The prescriptions below sit inside the strongest evidence we have on tempo manipulation in resistance training, applied to a movement on which no direct RCT exists. The Confidence rating reflects how directly the cited evidence applies to the prescribed conditions, high when meta-analytic data supports the parameter range, moderate when extrapolated from related movements, low when the row rests on practitioner convention rather than peer-reviewed data.

The default row at 3-0-X-0 sits inside two pieces of strong evidence applied at one remove. Schoenfeld, Ogborn and Krieger (2015) established that repetition durations between 0.5 and 8 seconds produce equivalent hypertrophy when sets approach failure, and that durations longer than 10 seconds appear inferior. A 3-0-X-0 tempo at 3-5 reps yields 12-25 seconds of total time under tension, comfortably inside the productive band. Wilk, Zajác and Tufano (2021) reviewed the tempo literature and concluded that a slower eccentric paired with a faster concentric is the configuration best supported for hypertrophy goals.

The transition-skill row at 3-2-X-0 uses Folland et al. (2005) angle-specific strength findings as its rationale, isometric strength gains carry roughly 20-45 degrees around the trained angle. A two-second isometric pause at the chest-clear position trains the exact angle at which most failed muscle-up attempts collapse. This is the strongest available rationale, but it is inferred from a single-joint isometric study, not validated on a compound bodyweight lift. Treat as low confidence.

The third row formalizes a coaching standard rather than a hypertrophy prescription: tempo 3-0-X-0 serves as a movement-quality audit. If the lifter cannot perform the muscle-up cleanly at a three-second eccentric, they do not yet own the movement. Kipping and momentum-driven reps are acceptable as a separate skill, but strict-with-tempo is the gold standard for assessment.

What the page must concede honestly: tempo on the muscle-up is not a hypertrophy lever in the way that 3-0-X-0 on a lat pulldown is. The contributing muscles (latissimus dorsi, pectoralis major, triceps brachii, biceps brachii, trapezius) are best grown through the underlying volume of pull-ups, dips, and rows that produced the muscle-up base in the first place. Tempo on the muscle-up earns its place as a skill-acquisition, motor-learning, and connective-tissue-loading lever. The Enes, Piñero, Korakakis and Schoenfeld (2025) meta-analysis on rep tempo found a pooled standardized mean difference of 0.09 between fast and slow tempos for hypertrophy, trivially small. This is the most current word on the topic and the page does not overclaim against it.

The muscle-up negative: the most evidence-defensible progression tool on this page

If the muscle-up has the thinnest direct evidence base of any exercise in this cluster, the muscle-up negative is the prescription where extrapolated evidence reaches highest confidence. The chain of evidence is strong enough to recommend with conviction and weak enough that no responsible page can call it "proven." This section walks through that chain.

The fundamental rationale is the eccentric-to-concentric strength ratio. Nuzzo, Pinto, Nosaka and Steele (2023) published a meta-analysis pooling 340 effect estimates from 147 studies, finding that eccentric strength averages approximately 41% greater than concentric strength across human skeletal muscle in vivo. The ratio is greatly affected by movement velocity and is sparsely studied at joint-action resolution. This is the same 1.41 anchor that the slow-eccentric loading literature on the lat pulldown family rests on. Applied to the muscle-up: a trainee who cannot complete one concentric muscle-up, meaning they cannot produce 100% of their bodyweight in muscle-up-direction force at the transition, can on average resist roughly 141% of that load eccentrically.

The training-effect evidence is the second pillar. Roig et al. (2009) systematic review and meta-analysis on eccentric versus concentric resistance training found that eccentric training produces equal or greater hypertrophy than concentric at matched volume, with eccentric strength gains favoring the eccentric mode and concentric strength gains transferring from eccentric training as well. Schoenfeld, Ogborn, Vigotsky, Franchi and Krieger (2017) extended this with a contraction-type-specific meta-analysis, reporting a mean change of 10.0% for eccentric versus 6.8% for concentric in hypertrophy outcomes, a small edge for eccentric that did not reach robust statistical significance across all subgroups. The page does not overstate this: eccentric is at minimum equal for size and clearly favored for eccentric strength specifically. That second outcome is exactly what a muscle-up negative trains.

Hortobágyi et al. (1996), in the foundational isokinetic-training study, found that 12 weeks of eccentric quadriceps training increased eccentric strength roughly 3.5 times more than concentric training increased concentric strength (46% versus 13%, p < 0.05). The asymmetry is large. Eccentric training also improved concentric strength; concentric training improved eccentric strength less. This is single-joint, isokinetic, lower-body work, the inference to compound bodyweight muscle-up is loose, but the directional finding is consistent across the eccentric literature.

The honest nuance: at the transition position, the 1.41 ratio compresses. The transition occurs at peak humeral flexion with scapular upward rotation and protraction, the position where moment arms collapse and the contributing muscles operate at unfavorable mechanical leverage. The Nuzzo et al. (2023) ratio is pooled across joint actions, not measured at specific compromised positions; Folland's angle-specific findings argue that strength differences between contraction modes likely vary by joint angle. Practical implication: muscle-up negatives at the transition are harder than naive 1.41 math predicts. Most trainees fail the negative at exactly the transition position, the same position they fail the concentric. This is theoretical inference from Nuzzo plus Folland plus practitioner observation; not direct measurement.

The standard protocol synthesizes the meta-analytic evidence with practitioner-authority specifics. Steven Low's Overcoming Gravity (2nd ed., 2016) prescribes 3-5 reps × 3 sets at a 5-8 second eccentric, twice weekly. Invictus Fitness publishes similar prescriptions in their gymnastics programming. Repko's working recommendation:

• 3-5 sets × 3-5 reps
• 5-8 second eccentric descent (notation: 5-0-X-0 to 8-0-X-0; the X covers the jump or step-up to top, not a pulled rep)
• Jump, step, or band-assist to the support position, this is not a concentric attempt
• 48-72 hours between sessions; eccentric muscle damage and connective-tissue recovery require it
• Cap eccentric duration at 8 seconds; longer is outside the Schoenfeld 2015 equivalence ceiling and is practitioner convention only

The progression rule is empirical: when the lifter can perform 3 clean controlled descents at 5 seconds, extend to 6 seconds. At 6 seconds clean for the prescribed volume, extend to 7. At 7-8 seconds clean with a controlled transition, the trainee is typically weeks-to-months from a first concentric attempt. The transition to a first strict muscle-up is gated by clean execution of the negative, not by an arbitrary duration target.

The phase-gated progression sequence

The pathway from "first pull-up" to "first strict muscle-up" is well-rehearsed across coaching literature. The structure below organizes it around capability gates rather than tempo abstractions, because muscle-up progression is fundamentally a strength-prerequisite problem. Most failed muscle-up attempts are not failed transitions, they are failed pulls. Solve the pull and the rest of the lift becomes coachable.

An explicit caveat that must precede the table: none of the gates below are research-validated. They are convergent practitioner consensus across Steven Low, Invictus Fitness, BarBend, WODprep, Pamela Gagnon, and the StrongFirst community. They are the best available coaching synthesis; they are not RCT evidence.

Phase 0 is where most readers actually live. Without a pull-up base, every layer above collapses. The strongest evidence on this page tells you to spend time on the pull-up family before you spend any time on the muscle-up family. Repko's deep-dive on the open-chain pull pattern lays out the eccentric-only pull-up negative protocol that builds the same base, anchored on the same Nuzzo 2023 meta-analytic ratio.

Phase 1 consolidates the pull-up base into the specific qualities the muscle-up requires. The chest-to-bar pull-up trains pull height; weighted pull-ups train the strength reserve that lets the chest clear the bar by the additional height the muscle-up transition needs; explosive pull-up work trains the rate of force development that practitioners argue separates the "ready to attempt a muscle-up" lifter from the "still in Phase 1" lifter. These claims are coaching consensus across multiple sources; none have been tested in a controlled trial.

Phase 2 introduces the prescription this whole page exists to defend: the muscle-up negative. The full protocol sits in the dedicated section above. The gate criteria, 5-7 strict chest-to-bar reps plus a weighted pull-up at a quarter of bodyweight, are the most consistent threshold across practitioner sources. Steven Low names similar numbers; Pamela Gagnon's programming uses weighted-pull-up benchmarks at this level; the BarBend coaching content converges on the same range.

Phase 3 and Phase 4 rest entirely on coaching consensus. There is no peer-reviewed paper on first-muscle-up timelines, jumping or banded muscle-up effectiveness, or the optimal sequencing of weighted negatives after a first clean strict rep. Practitioner timelines for Phase 3 to Phase 4 range from 8 to 26 weeks; the variability is wide and the data are anecdotal.

Injury risk and the kipping question

The muscle-up has more documented injury epidemiology than tempo evidence. This is a notable inversion in the literature: the lift is under-studied in training trials but well-studied in the orthopedic context of CrossFit shoulder injuries. The page acknowledges both sides honestly.

Summitt, Cotton, Kays and Slaven (2016) surveyed 187 CrossFit athletes; 23.5% reported prior shoulder injuries. The most-implicated exercises were overhead press (25%), snatches (20%), and kipping pull-ups (10%). Hopkins and colleagues (2022) published a current-concepts review in Current Reviews in Musculoskeletal Medicine identifying three mechanisms in CrossFit upper-extremity injury: eccentric loading, subacromial and internal impingement, and extraphysiologic motion. They wrote: "Certain gymnastic-type movements, especially the Kipping pull-up, put the athlete at high risk for this injury pattern by loading the shoulder in a high degree of abduction." Kipping pull-ups specifically were associated with partial articular-sided posterior rotator cuff tears, posterosuperior labral tears, and posterior capsule scarring.

The 2025 prospective Greek CrossFit study (NCT05909592, published PMC12286157) tracked injuries across a cohort and reported shoulder injuries at up to 40.6% of all injuries, with the supraspinatus tendon as the most frequent site of partial tear. Kipping gymnastic movements, ring dips, ring muscle-ups, kipping pull-ups, were repeatedly identified as high-risk.

The critical distinction the page must hold: the injurious eccentric loading documented in this literature is uncontrolled, fatigue-driven, momentum-driven eccentric loading at end range. Hopkins et al. specifically described the mechanism as "many of the motions utilized in… the gymnastic moves including pull-ups and muscle-ups utilize momentum to generate enough force to complete the exercise." A muscle-up negative performed deliberately, with controlled 5-8 second descent, fresh, at moderate volume, with 48-72 hours of recovery between sessions, is a different stimulus from a high-volume kipping muscle-up at the end of a metabolic conditioning workout. The first is a training prescription; the second is the injury vector the literature documents.

Scapular control work belongs alongside any muscle-up training program. Cools, Struyf, De Mey, Maenhout, Castelein and Cagnie (2014) published the standard rehabilitation framework for scapular dyskinesis in overhead athletes, emphasizing serratus anterior activation, lower trapezius strengthening, and glenohumeral mobility work. This is the prehab citation that any muscle-up program should respect. Repko's prescriptions assume the lifter is integrating scapular-control work as accessory; the page does not prescribe it directly because that work is not muscle-up specific.

Time under tension and the Schoenfeld ceiling

The framing the page must hold consistently with the rest of the Repko cluster: tempo is not a primary hypertrophy lever, especially on the muscle-up. Schoenfeld, Ogborn and Krieger (2015) remains the upper bound, rep durations between 0.5 and 8 seconds produce equivalent hypertrophy when sets approach failure, with longer durations appearing inferior. Wilk, Zajác and Tufano (2021) reviewed the tempo literature with the caveat that "deliberate manipulation of movement tempo may not be possible when exercises are performed with heavy loads." The muscle-up at bodyweight is, for many trainees, exactly the heavy-load regime where that caveat applies.

The 2025 update is the most important single piece of evidence on tempo and hypertrophy. Enes, Piñero, Korakakis, Schoenfeld and colleagues published a systematic review with meta-analysis in JSCR finding that resistance training tempo has minimal overall effect on hypertrophy, with a pooled standardized mean difference between fast and slow tempos of approximately 0.09. The earlier Androulakis Korakakis, Wolf, Coleman, Burke, Piñero, Nippard and Schoenfeld (2024) narrative review recommended rep durations between 2 and 8 seconds as the productive band but framed tempo as a refinement variable rather than a primary one.

For the muscle-up specifically this means: hypertrophy of the contributing muscles (latissimus dorsi, pectoralis major, triceps brachii, biceps brachii, trapezius) is best driven by the underlying volume of pull-ups, dips, and rows that built the base, not by tempo manipulation of muscle-up reps themselves. Tempo earns its place on the muscle-up page for three reasons that are not hypertrophy: motor learning at the transition position, controlled connective-tissue loading at a mechanically vulnerable shoulder angle, and angle-specific strength acquisition per Folland 2005. The page does not claim tempo on muscle-ups grows muscle better than tempo on simpler patterns. That claim would not survive review.

Common errors specific to the muscle-up

Six prescription errors recur across muscle-up coaching, each grounded in either documented injury epidemiology or basic biomechanics.

Training kipping muscle-ups before a strict strength foundation

This is the most documented injury vector in the literature. Hopkins et al. (2022) and the 2025 Greek CrossFit cohort both implicate high-volume kipping under fatigue as the canonical mechanism for partial rotator cuff tears and labral pathology. The fix is sequencing: strict strength foundation first, kipping only as a separate skill layer added after.

Chicken-wing or asymmetric transition

When the chest is not pulled high enough, lifters often resort to an asymmetric transition, one arm crosses first, then the other. This unilaterally loads the leading shoulder at peak humeral flexion plus internal rotation. Prinold and Bull (2016) identify this exact loaded-high-elevation pattern as the canonical impingement risk. The fix is upstream: train pull height until both arms can transition simultaneously.

Pull height insufficient

The transition fails because the chest does not clear the bar by enough. Lifters then jump or kip to bridge the gap. The fix is to build chest-to-bar capacity and explosive pull-up rate of force development, the muscle-up transition does not need a kip if the pull does its job.

Wrist hyperextension on rings false grip during eccentric

This is ring-specific and largely avoidable on the bar. False-grip kinematics have no peer-reviewed quantification, but practitioner consensus across Steven Low, Pamela Gagnon, and the gymnastics coaching tradition identifies the eccentric descent on rings under a marginal false grip as the highest-risk moment for skin tears at the pisiform, wrist laxity, and forearm-flexor strain. The bar variant largely sidesteps this; bar false-grip is optional and shorter-duration. Pamela Gagnon's standard framing: "I don't think you need a complete false grip to do a strict bar muscle-up, but you do need to engage those forearms."

Elbow tendinopathy from stacked volume

Bar muscle-ups (pronated grip) load the distal biceps less than chin-ups would, but the transition introduces elbow positions specific to the lift, and a long eccentric increases time under tension at the elbow. Stacking a muscle-up program on top of high-volume biceps or chin-up training is a documented tendinopathy risk pattern in calisthenics populations. The fix is volume awareness across all elbow-flexion-under-load work.

High-volume fatigued negatives

The protective mechanism of the controlled muscle-up negative is the controlled part. A negative performed under fatigue, with the descent uncontrolled past the transition, is mechanically indistinguishable from a failed kipping rep, the same momentum-driven loading at end range that the injury literature documents. The fix is volume discipline: 48-72 hours between negative sessions, cap volume at 3-5 reps × 3 sets, terminate the session if quality degrades.

Frequently asked questions

What's the best tempo for muscle-up negatives?

5-8 seconds eccentric per descent, 3-5 reps × 3 sets, twice weekly with 48-72 hours between sessions. The 8-second ceiling is bounded by Schoenfeld, Ogborn and Krieger (2015): repetition durations longer than 10 seconds appear inferior for hypertrophy and offer no clear benefit. The 5-second floor is bounded by practitioner consensus (Steven Low, Invictus, Coach Sommer) that faster eccentrics do not allow the lifter to learn the transition position. No peer-reviewed RCT directly tests tempo on muscle-up negatives. The prescription rests on extrapolation from the Nuzzo et al. (2023) meta-analytic eccentric-to-concentric strength ratio, Roig et al. (2009), and Schoenfeld et al. (2017) contraction-mode meta-analyses.

How many pull-ups do I need before training muscle-up negatives?

Convergent coaching consensus across Steven Low's Overcoming Gravity, Invictus Fitness, BarBend, and WODprep places the floor at 8-12 strict pull-ups plus 5-7 strict chest-to-bar reps. The widely-quoted weighted-pull-up-at-half-bodyweight rule is practitioner heuristic with no peer-reviewed validation. The honest answer: ten strict pull-ups plus clean chest-to-bar capability is a reasonable floor, but it is coaching consensus, not RCT evidence. No published study establishes muscle-up prerequisites at any threshold.

Should I do bar muscle-ups or ring muscle-ups first?

Bar first. Walker et al. (2023) is the only direct EMG comparison and found rings significantly increase upper-trap, biceps brachii, and forearm-flexor activation in the pull phase (all p < 0.01) and triceps brachii and biceps brachii in the push phase compared to the bar variant. The authors concluded the bar muscle-up "may be a better technique to learn first due to its lower difficulty." Rings also demand more shoulder external-rotation mobility and place wrist-extension stress under the false grip during the eccentric.

Is kipping muscle-up bad for my shoulders?

The injury-epidemiology literature is consistent. Hopkins et al. (2022) identified eccentric overhead loading, subacromial impingement, and extraphysiologic motion as the three injury mechanisms in CrossFit upper-extremity injuries, with kipping pull-ups and muscle-ups specifically flagged for partial articular-sided posterior rotator cuff tears and posterosuperior labral pathology. The 2025 Greek CrossFit prospective study (NCT05909592) reported shoulder injuries at up to 40.6% of all injuries. Kipping per se is not the issue; high-volume kipping under fatigue is.

Can I learn muscle-up without weighted pull-ups first?

Possible but inefficient. Convergent practitioner consensus (Mike Dewar, Pamela Gagnon, Steven Low) lands on weighted pull-ups at ≥0.25× bodyweight for Phase 2 entry and ≥0.5× bodyweight for transition-primer mastery. The mechanism is mechanical: the muscle-up requires a pull height significantly above the chest-to-bar pull-up, and the weighted pull-up builds the strength reserve that allows the pull to clear that height. No peer-reviewed paper validates these specific thresholds.

How long does muscle-up progression actually take?

No peer-reviewed paper exists on muscle-up progression timelines. Practitioner consensus across Steven Low, Invictus, and Pamela Gagnon converges on 12-26 weeks from first clean negative to first strict concentric muscle-up, for trainees who arrive with the Phase 1 base (8+ strict pull-ups, 5+ chest-to-bar) intact. Faster timelines exist with greasing-the-groove daily exposure but increase shoulder load. Repko's tempo timer enforces all four phases without requiring you to count in your head. The muscle-up negative, 5 to 8 seconds eccentric, no margin for drift, is exactly the lift where this matters most. Try Repko free.

The honest gap: what we don't know

The bar muscle-up has the thinnest peer-reviewed evidence base of any exercise Repko has covered. The page does not survive aggressive skeptical review by overclaiming; it survives by stating the gap precisely.

Zero peer-reviewed RCTs exist on muscle-up training, not on tempo, not on progression, not on prerequisites. The single direct study is Walker et al. (2023), a descriptive surface-EMG comparison in ten active males, single-session, no kinematic synchronization, no female subjects, no kipping versus strict comparison. No peer-reviewed paper segments the transition phase separately, the single most biomechanically interesting moment in the lift has zero direct measurement. Walker collapsed pull and push into two bins. Every transition-specific claim on this page is biomechanical inference from adjacent literature on the pull-up (Dinunzio 2019, Prinold and Bull 2016) and angle-specific isometric training (Folland 2005).

Practitioner authority carries the protocol specifics. Steven Low's Overcoming Gravity (2nd ed., 2016) and Coach Sommer's gymnastic methodology supply the tempo numbers, set-and-rep prescriptions, and progression sequences. Low has a Doctor of Physical Therapy and competed in Gymkana gymnastics; Sommer coached competitive gymnastics for decades. They are the most respected practitioner sources in English-language calisthenics literature. They are not RCT evidence and the page does not pretend otherwise.

The prerequisite thresholds (8 strict pull-ups, 5-7 chest-to-bar, weighted pull-up at ≥0.25× bodyweight) are convergent coaching consensus across multiple practitioner sources. No published study has tested or validated them. The tempo specifications (3-0-X-0, 5-0-X-0, 8-0-X-0) are extrapolations from the general tempo literature; no published study tests them on the muscle-up. The transition-compression argument for the 1.41 ratio is theoretical inference from Nuzzo 2023 plus Folland 2005 plus practitioner observation; no study has measured eccentric strength at the muscle-up transition specifically.

This is the page's defensible position. The meta-analytic backbone (Nuzzo 2023, Roig 2009, Schoenfeld 2015 + 2017, Wilk-Zajác-Tufano 2021, Enes 2025) is strong, and the chain of inference from those meta-analyses to the muscle-up negative is the strongest available rationale for any progression tool to a first muscle-up. The injury literature (Hopkins 2022, Cools 2014, the 2025 Greek CrossFit cohort) frames volume discipline and the kipping question with confidence. Where evidence runs out, the page says so. Honest, decision-ready, survives skeptical review precisely because it does not overclaim where the evidence is thin.

Closing

This page is part of Repko's tempo training cluster: the four-phase tempo guide covers the framework, eccentric training covers the slow-lowering literature this page leans on heavily, and tempo notation explained covers the language. The sibling exercise deep-dives on front squat tempo prescriptions for the squat side, deadlift and Romanian deadlift tempo prescriptions for the posterior-chain side, lat pulldown and pull-up tempo prescriptions for the open-chain pull pattern, and side plank and McGill Big 3 tempo prescriptions for static-isometric spine endurance extend the tier-3 cluster; the bar muscle-up brings the pull family into closed-chain advanced calisthenics. For background on why this app exists and who built it, see the about page. Repko's tempo timer enforces every digit of the prescription so you can train without counting in your head.