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Repetition maximum (RM)

Your 1RM for a given exercise is the heaviest weight you can lift at least once for this exercise. Studies on strength will often express a weight either as an “X”RM (where X is the maximum number of reps you can reach with that weight) or as a percentage of 1RM.

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Summary of Repetition maximum (RM)

One-repetition maximum (1RM). The heaviest weight you can lift. More precisely, the heaviest weight with which you can do one rep of a given exercise. For instance, if the heaviest weight you can bench-press at least once is 80 kg, then 80 kg is your bench-press 1RM.

Studies on strength will often express a weight either as an “X”RM (where X is the maximum number of reps you can reach with that weight) or as a percentage of 1RM.

  • 1RM. The maximum weight you can lift.

  • 25% of 1RM. If your 1RM is 80 kg, then 25% of your 1RM is 20 kg.

  • 15RM. The maximum weight you can lift a maximum of 15 times.

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