Ava Fitzgerald, C.S.C.S., C.P.T., a sports performance coach of the Professional Athletic Performance Center in New York says “Compared to training for strength, intensity is going to drop during the hypertrophy phase of a program, with intensity sitting between 50 and 75 percent of the person’s 1RM, the maximum weight he or she can lift for one rep,”
To get the volume your muscles need, she recommends performing each of your lifts for three to six sets of 10 to 20 reps.