What is the definition of one repetition maximum (1RM)?

The definition of one repetition maximum, or 1RM, refers specifically to the maximum amount of weight that an individual can lift for a single repetition of a particular exercise. This measure is fundamental in strength training as it provides insight into an athlete's strength level for that specific movement.

Understanding 1RM is crucial for setting training guidelines, as it is often used to determine appropriate weights for various percentages of maximum capacity when creating a strength training program. For example, training at 70% of one's 1RM can be effective for building muscular endurance, while training at higher percentages, such as 90% of 1RM, is typically used for developing maximal strength.

In contrast, the other options describe different aspects of strength and weightlifting but do not accurately define the one repetition maximum. Five consecutive repetitions does not focus on the maximum possible weight for a single rep, average weight doesn’t emphasize maximum effort, and assisted equipment suggests weights that are lowered due to additional support, which is distinctly different from measuring an individual’s absolute maximum capability.