Rep tempo
Also known as: Lifting tempo
Rep tempo is the speed or intended duration of the phases of a repetition. A program may prescribe it in seconds, such as 3-1-X-0: three seconds for the eccentric phase, one second in the bottom position, an explosive concentric intent, and no pause before the next repetition. Notation conventions vary, so the coach or program should define which position each number represents.
The eccentric phase is commonly listed first, followed by the transition at the end of it, the concentric phase, and the transition before the next rep. "X" means to accelerate as forcefully as appropriate rather than hit an exact time. Actual movement velocity may still be slow when the load is heavy or fatigue is high. Tempo therefore describes both timing and intent, and the two should not be confused.
Tempo can standardize form, limit bouncing or momentum, emphasize control, and make repeated performances more comparable. It also changes how much load and how many repetitions can be completed. If a set changes from one-second to five-second lowering, the same weight and rep count no longer represent the same task. Record a meaningful tempo change when evaluating progression.
There is no single lifting tempo that is best for every outcome. A systematic review and meta-analysis of repetition duration found similar hypertrophy across a broad range of practical repetition durations, with limited evidence for deliberately very slow repetitions. The 2026 ACSM position stand likewise did not find that time under tension consistently changed outcomes across the evidence it reviewed. Load, effort, volume, exercise, and progression remain important context.
For muscular power, a fast concentric intent is usually central and sets often stop before velocity falls substantially. For hypertrophy or technique practice, a controlled eccentric and a concentric performed with purposeful effort are common defaults, but "controlled" does not require counting identical seconds on every exercise. A pause can train a position or remove rebound, while excessively rigid counting can distract from breathing, balance, and the actual movement.