The period from adolescence to 18 years old is a period of sudden increase in human height (boys). At this time, you can exercise your muscles properly, but you can't be overweight.
In bodybuilding theory, RM is used to indicate the maximum number of repetitions that a 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.
8 to 12RM is the best exercise effect for beginners. It is suggested that the load should be adjusted to 15 to 30RM before 14 to 17 years old. 15 to 30RM, people tend to exercise endurance and muscles, which should not affect their height development. If the load is right, it should be increased.
There is a book called Prisoner's Fitness, which teaches people how to practice muscles by hand. The movement difficulty is divided into six grades, which are suitable for exercisers of different degrees. Because the link can be easily deleted, the landlord Baidu knows that it can be found by searching for prisoner fitness.