Rep Tempo

Rep tempo describes the timing of each phase of a repetition, such as lowering, pausing, and lifting.

Rep tempo describes the timing of each phase of a repetition, such as lowering, pausing, and lifting. This page provides a definition and practical context; it is not an individualized medical or nutrition prescription. Use the related tools and guides for calculations or programming decisions rather than treating a glossary definition as a result.

Reading and using tempo notation

Tempo is usually written as four numbers, for example 3-1-1-0, representing the eccentric (lowering), the pause at the stretched position, the concentric (lifting), and the pause at the top, each in seconds. Slowing the eccentric phase increases time under tension and can increase muscle damage and metabolic stress for a given weight, which is useful for hypertrophy-focused isolation work but generally counterproductive for maximal-strength training, where a fast, forceful concentric is part of the skill being trained. Most programs only prescribe tempo deliberately for specific goals (tendon loading, technique correction, added hypertrophy stimulus); outside of those cases, a natural, controlled tempo without an explicit prescription is the default.

Common tempo mistakes

The most frequent mistake is letting the eccentric (lowering) phase happen faster than intended, which is easy to do unconsciously as fatigue builds late in a set. If a tempo is prescribed for a specific reason, technique cueing or counting out loud on the lowering phase helps keep it consistent across a set rather than only on the first clean rep.

Frequently Asked Questions

How do you read lifting tempo numbers like 3-1-1-0?
The four numbers represent: 1) eccentric/lowering phase (3 seconds), 2) stretched bottom pause (1 second), 3) concentric/lifting phase (1 second), and 4) top contracted pause (0 seconds).
What is the optimal rep tempo for muscle growth?
Research suggests that any repetition duration between 2 and 6 seconds per rep—typically 2 to 3 seconds lowering under control and an explosive or 1-second lift—stimulates optimal hypertrophy, provided sets are taken close to failure.
Why is controlling the eccentric phase important?
Controlling the eccentric phase ensures muscles absorb tension against gravity rather than joints and connective tissues, maximizes mechanical tension during lengthening, and prevents bouncing at the bottom of the movement.