What is the one rep max?

As a fitness and strength training expert with years of experience in the field, I can tell you that the term "one rep max" (1RM) refers to the maximum amount of weight that a person can lift for a specific exercise, such as a bench press, squat, or deadlift, for one full repetition with proper form. It's a common metric used to measure strength and to plan training programs.

To determine your 1RM, you would typically perform an exercise with progressively heavier weights until you reach a point where you can only lift the weight once. However, it's important to approach this with caution as lifting extremely heavy weights can be dangerous if not done properly.

Here's a simple formula that can be used to estimate your 1RM based on a known number of repetitions (R) you can perform with a certain weight (W):

1RM = W × (1 + 0.0333R)

For example, if you can bench press 100 pounds for 5 reps, your estimated 1RM would be:

1RM = 100 × (1 + 0.0333 × 5) = 100 × 1.1665 ≈ 116.65 pounds

Please remember that this is an estimation and individual results may vary. It's always best to test your 1RM in a controlled environment with proper supervision.

One-repetition maximum (one rep maximum or 1RM) in weight training is the maximum amount of force that can be generated in one maximal contraction. ... One repetition maximum can also be used as an upper limit, in order to determine the desired "load" for an exercise (as a percentage of the 1RM).