Training glossaryFundamentals & measures
1RM (one-rep max)
1RM is the heaviest load you can lift for a single repetition with good technique in a given exercise.
Also known as: One-rep max · Repetition maximum
1RM works as a reference for programming intensity: many plans describe load as a percentage of 1RM (for example, 80% of 1RM).
Because testing a true 1RM requires maximal loads and carries more risk, it is common to estimate it from a submaximal set using formulas such as Epley and Brzycki.
Sources
Scientific references behind this entry.
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