For teenagers, proper leg muscle training is still needed, so you don't have to be afraid of growing up if you choose the right project.
Optional: leapfrog, squat, standing, no weight training.
What to avoid: I want the right equipment for exercising thigh muscles in the gym, but I don't want this, that's all.
Exercise may have side effects, but don't give up eating because of choking!
Suggestion:
If you want to gain weight, you should eat more protein, especially foods containing amino acids, such as flour, wheat germ, beans, shrimp, crab, shellfish, seaweed, beef, chicken, liver, pork legs, eggs, milk, cheese and dark vegetables. On the contrary, white rice, glutinous rice, desserts and other foods should be avoided as much as possible. It is better to eat less cola and fruit juice, because it contains more sugar, which will hinder the absorption of calcium, and eating too much will affect the development of bones. In addition, salt is also the enemy of increase, so we must form the habit of eating less salt.