Bodybuilders exercise muscles in four different ways for a muscle group, such as biceps. The number of groups is more than 20, that is to say, for each part, the weight used is 60% to 80% of the weight they can pick up, and 10 to 15 groups will be effective. If you want to write seven, write biceps, triceps, deltoid, latissimus dorsi, trapezius, abdominal muscles and thighs or calves. It is very tiring to write. You'd better ask me specifically by adding q. My number is 420507556.