# One-rep max

One-rep max (1RM) is the heaviest load you can lift once with good form for a given exercise.

Training loads are often set as a percentage of 1RM. It can be estimated from a set of a few reps with formulas such as Epley (weight × (1 + reps ÷ 30)) or Brzycki, which is safer than testing a true maximum.

Also called: 1RM.

Related: [Progressive overload](https://revns.com/dictionary/progressive-overload.md), [RPE](https://revns.com/dictionary/rpe.md)

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