When predicting a 1 RM for a client who can perform 10 reps with 200lbs, what would their estimated 1 RM be?

To estimate a one-repetition maximum (1 RM) based on the ability to perform 10 repetitions at a certain weight, several predictive formulas can be utilized. One commonly used formula is the Epley formula, which posits that the 1 RM can be estimated by using the weight lifted and the number of repetitions performed. Specifically, the formula is:

1 RM = Weight × (1 + (Reps / 30))

In this instance, the weight lifted is 200 lbs and the number of repetitions performed is 10. Applying the values in the formula gives:

1 RM = 200 × (1 + (10 / 30))

1 RM = 200 × (1 + 0.333)

1 RM = 200 × 1.333

1 RM = 266.67 lbs, which can be rounded to approximately 267 lbs.

This calculation aligns with the correct choice. The selection of 267 as the estimated 1 RM reflects a proper understanding of how to utilize repetition maximum formulas to predict maximum lifting capacity based on known performance metrics. This estimation provides a practical method for guiding training loads and setting appropriate goals for clients.