What is 1RM (One Rep Max)?

The maximum amount of weight a person can lift for one repetition of a given exercise.

A 1RM (One Rep Max) is the gold standard for measuring absolute strength. Powerlifters train to peak their 1RM for competition. You can either test a true 1RM by attempting it, or you can estimate it using calculators and formulas like Epley or Brzycki based on higher rep sets.

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