1. Heavy 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. It can be seen that the load weight of 5- 10RM is suitable for bodybuilding training to increase muscle mass.

2. Multi-group number: Do 2~3 groups when you think of exercise. 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.

3. Long displacement: No matter rowing, bench pressing or bending, put the dumbbell as low as possible to fully stretch the muscles, and then raise it as high as possible. This article sometimes conflicts with "continuous tension", and the solution is to quickly pass the "locked" state. However, I don't deny the role of heavy half-course exercise. 4. Slow speed: slowly lifting and then slowly lowering 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. 5. High density: "density" refers to the rest time between the two groups, and the rest time of 1 minute or less is called high density. To increase muscle mass rapidly, it is necessary to take less rest and stimulate muscles more. "Multi-group number" is also based on "high density". When you exercise, you should concentrate on training like a war, and don't think about anything else.