← All guidesRep Tempo: Does Speed Affect Training Results?
Set a cadence like 3-1-1-0 on any exercise and the voice counts every second for you. Before you set one, it is worth knowing what a cadence buys — and what it does not.
Updated August 11, 2026
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AI-researched
Tempo training assigns a speed to each phase of a repetition, written as four numbers: eccentric (lowering), pause at the bottom, concentric (lifting), pause at the top. A 3-1-1-0 squat is three seconds down, a one-second hold, one second up, and straight into the next rep.
The usual argument for it is that going slower raises "time under tension" and therefore builds more muscle. That argument has been tested directly by two meta-analyses, and neither supports it. This does not make tempo useless — it makes it useful for different reasons than most people are given.
What the evidence says
A 2015 meta-analysis pooled eight training studies that compared tempos directly — all of them training to failure, running at least six weeks, and measuring muscle by biopsy or imaging. Its conclusion: hypertrophic outcomes are similar across repetition durations from 0.5 to 8 seconds. [1]
A meta-analysis a decade later asked the same question with tighter methods, comparing slower repetitions (1.7–4.5 seconds, averaging about 3.5) against faster ones (0.3–2 seconds, averaging about 1). Within-group effects were close — 0.43 for faster, 0.34 for slower — and the central estimate of the difference between them was 0.09, which is trivial and if anything points the other way. Subgroup analyses by muscle action, body region, and training to failure came out trivial to small as well. [2]
Repetition duration
What the evidence shows
What it means
About 0.5–8 s
Similar hypertrophy [1][2]
That is a wide window. Inside it, tempo is not the variable to optimise.
Deliberately over 10 s
Worse for hypertrophy [1]
The load has to drop so far that the mechanical tension goes with it.
Deliberately slow concentric
Smaller maximal-strength gains [4]
The penalty is on the lifting phase, not the lowering: a meta-analysis of eccentric phase duration found longer eccentrics gave equivalent or greater strength gains in trained lifters and in volume-matched trials. [9] When strength is the goal, lift with intent rather than on purpose slowly.
Slowing the tempo raises time under tension, and more time under tension means more muscle.
Time under tension is an outcome of how you trained, not an input you can raise on its own. You can stretch a set out with a very light load while the muscle produces very little force — and the tempo trials are the direct test of that idea, which it failed. What the evidence keeps pointing at instead is mechanical tension and how close the set comes to failure: a controlled trial had resistance-trained men train to failure with high and low loads, and growth was similar either way. [5] That is hard to reconcile with duration being the driver.
What slowing down costs
Tempo is not free. A review of movement tempo reports that slower tempos reduce the external load you can use and reduce the number of repetitions you can complete with a given load — the longer each rep takes, the fewer of them fit in a set. [3] Slowing down is therefore not something added on top; it is load and reps traded for duration.
For maximal strength the cost is more direct. A trial ran the same bench-press programme in two groups differing only in actual concentric velocity — one lifting at maximal intended velocity, the other deliberately at half. The maximal-intent group gained more bench-press performance. [4] The same group reported the same direction in the squat. The point is not that fast is good; it is that deliberate slowness has a bill attached when strength is the goal.
So is a cadence worth setting?
Yes — as a control lever rather than a growth lever. Once you stop expecting extra muscle from it, what is left is still real:
It removes momentum. A push-up or squat bounced out of the bottom looks like a controlled rep and asks far less of the muscle — the assistance from that rebound decays exponentially with any pause, with a half-life of about 0.85 seconds. [6] Be clear about the limit, though: a trial that gave one of a person's limbs strict reps and the other deliberately momentum-assisted ones found no difference in growth once both went to failure. [7] This is a claim about what a rep asks of the muscle, not a promise about growth.
It makes bodyweight hard. Body weight is a fixed load — you cannot add a plate to a push-up. Until you can add load, controlling the descent is one of the few dials available: at the same load, a slower tempo means fewer repetitions in the set. [3] Note what it buys: reaching a hard effort sooner, not extra growth.
It makes reps comparable. "Did I improve?" only means something if this week's reps were performed the same way as last week's. Self-selected duration drifts as fatigue accumulates, and a cadence pins that variable down. [8] Treat it as bookkeeping: when prescribed and self-selected durations were compared head to head, strength and hypertrophy came out the same. [8]
It helps you learn a movement. Early on, slowing down buys you time to feel where you are — a technique problem, not a stimulus one.
A pause can do a specific job. One second at the bottom kills the bounce in a squat or a push-up — it removes more than half of the rebound's assistance [6] — and makes the lengthened position something you pass through rather than rebound out of.
A default that is good enough
Lower for 2–4 seconds, lift with intent, and add a pause only where it does a job. That sits inside the range where the evidence shows no penalty while collecting everything control has to offer. It matters that the slow part is the lowering and not the lift — the evidence on eccentric duration shows no strength cost. [9] Past 8 seconds a rep you are buying nothing; past 10 you are paying.
How the voice-counted tempo works
Counting seconds in your head is exactly the kind of distraction that ruins a rep, and it is not accurate either — without an external cue, repetition duration drifts as fatigue accumulates. [8] So the timer counts instead.
Give any exercise interval a tempo — each phase from 0 to 5 seconds (e.g. 3s down / 1s up).
For the first 3 reps, the voice speaks every second of every phase: "1, 2, 3" down, "1" up.
From rep 4 the counting hands off to soft beeps at each phase change — a low tone to start the descent, a higher one to lift — or keeps counting if you prefer.
The tempo and current phase are shown on screen next to the countdown, and counting pauses automatically around interval announcements.
A single switch in the timer's audio settings turns all tempo cues on or off.
The free Dumbbell Workout preset ships with tempos already set: squats and sumo deadlift squats at 3-0-1-0, lunges and shoulder press at 2-0-1-0, and Romanian deadlifts at 3-1-1-0 with a one-second hold at the bottom. Run it once to hear the counting, then give your own exercises a tempo — every exercise in a workout can have a different one. Like the rest of the core timer, tempo counting is free and works fully offline.
Build your tempo workout
Frequently asked questions
What is tempo training?
Tempo training assigns a speed to each phase of a repetition. It is written as four numbers — eccentric (lowering), pause at the bottom, concentric (lifting), pause at the top — so 3-1-1-0 means 3 seconds down, a 1-second hold, 1 second up, and straight into the next rep. It is a way of specifying how a repetition is performed, not a separate training method.
Does a slower tempo build more muscle?
No, on the current evidence. A 2015 meta-analysis found similar hypertrophy across repetition durations from 0.5 to 8 seconds when sets were taken to failure, and a 2025 meta-analysis comparing slower reps (about 3.5 seconds on average) against faster ones (about 1 second) found trivial differences that if anything slightly favoured the faster tempo. The one clear finding is at the extreme: deliberately very slow repetitions, beyond about 10 seconds each, are worse for growth.
Is time under tension what makes a set work?
Not on its own. Time under tension is a result of how you trained, not an input you can raise in isolation and expect more growth — you can extend a set with a very light load and produce little tension, and the tempo meta-analyses are the direct test of that idea. What the evidence keeps pointing at is mechanical tension and how close the set comes to failure: training to failure produces similar growth across a wide span of loads, which is hard to reconcile with duration being the driver.
What does slowing down cost?
Load and repetitions. A review of movement tempo found that slower tempos reduce the external load you can handle and reduce the number of repetitions you can complete with a given load. For maximal strength the cost is more direct: a trial comparing the same bench-press training performed at maximal intended concentric velocity against deliberately half-maximal velocity found larger strength gains in the maximal-intent group.
What tempo should I actually use?
A controlled lowering phase of about 2 to 4 seconds, then lift with intent rather than deliberately slowly — that keeps you inside the range where the evidence shows no penalty, while removing the momentum that makes a rep easier than it looks. Add a pause only where it does a specific job, such as killing the bounce at the bottom of a squat or a push-up. Anything past roughly 8 seconds per rep is buying nothing, and past 10 is costing you.
How does the voice counting work?
Set a tempo on any exercise interval (each phase 0–5 seconds). While the interval runs, Omini speaks a number for every second of every phase — "1, 2, 3" on the way down, "1" on the way up — for the first 3 reps so you lock in the rhythm. After that it switches to soft beeps at each phase change, or keeps counting if you prefer.
Can each exercise have its own tempo?
Yes. Tempo is set per exercise interval, so squats can run 3-0-1-0 while Romanian deadlifts run 3-1-1-0 in the same workout. A per-timer switch turns all tempo cues on or off, and rest intervals never count.
Is the tempo timer free and does it work offline?
Yes. Tempo counting is part of the free core timer, and the number clips are bundled with the app, so counting works fully offline with the screen locked. The built-in Dumbbell Workout preset comes with tempos already set so you can try it immediately.
References