Weight and low frequency: in bodybuilding theory, RM is used to indicate the highest number of repetitions that a certain load can do continuously. For example, an exerciser can only lift a heavy object five times in a row, so the heavy object is 5RM. The research shows that: 1-5RM load training can thicken muscles and develop strength and speed; 6- 10RM load training can make muscles thick and strength speed increase, but endurance growth is not obvious; The muscle fibers of 10- 15RM were not obviously thickened, but their strength, speed and endurance were improved. After 30RM load training, the number of muscle capillaries increased, and the endurance was improved, but the strength and speed were not improved obviously.

Multi-group number: whenever you think of exercise, do 2 ~ 3 groups. In fact, it is a waste of time and you can't grow muscles at all. You must set aside 60 ~ 90 minutes to focus on a certain part, and do 8 ~ 10 groups for each movement, so as to fully stimulate the muscles, and the longer the muscles need to recover. Until the muscles are saturated, "saturation" should be felt by yourself, and the degree criteria are: acid, swelling, numbness, firmness, fullness and swelling, and the muscle shape is obviously thick.

Slow speed: slowly lift, and then slowly put down, will stimulate the muscles deeper. Especially when putting down the dumbbell, we should control the speed and do concession exercises, which can fully stimulate the muscles. Many people ignore the concession movement, even if they lift dumbbells, they will soon put down their tasks and waste a good opportunity to increase their muscles.