Understanding One Rep Max
Your one-rep max (1RM) is the maximum weight you can lift for one repetition with good form. It is used to set training intensities (e.g. 80% of 1RM for 5 reps). Brzycki and Epley are two common formulas that estimate 1RM from submaximal reps; results are estimates, not a substitute for a true tested 1RM.