One-repetition maximum

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).

By understanding the maximal potential of the muscle, it is possible to reach resistance overload by increasing the number of repetitions for an exercise.

However, as adequate rest must be given between attempts, proper 1RM assessment may be very time-consuming if the initial weight is far from the 1RM.

[2] Novices may find the procedure intimidating and unnerving, and be reluctant to add weight.

[4] The use of anthropometric variables such as gender, age, height, weight, body fat percentage, and girth does not improve accuracy.

[5] Also, most formulas are for experienced weightlifters, and novices may find their actual one rep maximum is much lower because their nervous system cannot handle the stress of a high weight.

The formulas can also be used the other way, to calculate what weight is needed for a given repetition maximum, as a percent of the estimated or actual 1RM.