1-4RM mainly trains absolute muscle strength and physical strength;
6- 12RM is mainly for training muscle mass;
15-20RM is mainly used to train small muscle groups and enhance muscle lines and elasticity;
30RM and above are mainly used to reduce body fat and enhance cardiopulmonary function.
So if it is to increase muscle mass, the selected weight is 6- 12RM. But I personally suggest that you'd better use 1-4RM every other week to improve your muscle strength, because only when your strength increases can you complete 6- 12RM with a heavier weight and your muscles grow faster!
Try to arrange 12- 16 groups of this kind of muscle training every day within your own ability. If you choose to increase the RM of muscle mass to 6- 12, a muscle basically needs to be trained more than 100 times, but it also varies from person to person. Beginners can reduce the amount of training appropriately and wait until they get used to it, mainly to make the muscles trained that day reach a state of exhaustion!
One more thing, of course, is to let the muscles rest between groups! It also depends on your situation! 30 seconds -2 minutes, but the shorter the break, the better. As long as the heart rate is relatively stable, you can continue to train the next group!
Training time should not be too long, an hour or so is enough! !
So my suggestion is that if you want to gain muscle, the weight should be 6- 12RM, and four groups are enough, because there is a lot of exercise in each part, and this weight is enough to make you exhausted.
I am the coach of Shenzhen Haofan Fitness Club. If you don't understand anything, just ask.