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Fitness is not friendly.
No, not as long as you exercise correctly. Teenagers are not fully developed, so you should pay more attention not to get hurt, which will not affect your height, but teenagers' bones are not fully developed and are easy to get hurt. Bone injury will really affect you, so you should lay a good foundation of knowledge first and don't imitate others' actions at will. You must first know whether an action is unfriendly to bones and joints and whether the action you can do is correct.

Like a bench brace, if you shrug your shoulders and press forward, you will wear out the rotating muscles.

We must grasp the details of the operation.