1 hour is a long time and will consume muscles. Just practice for 40 minutes, eat less and eat more, and you will grow up. The key to fitness is persistence. The effect of my three months is very obvious. Eat more protein, lean meat, rice or steamed bread. You may not be old enough, but you will gain weight at a certain age. It's okay, I wish you success!

It's even harder if you have a bad stomach, because you have to eat first if you want to gain weight. With good nutrition, you won't lose weight when you practice.

Thin people have the most obvious fitness effect, because there is no fat burning, which is directly muscle growth.

Because the gym is an inverted parabola.

That is, the muscles will not increase significantly in the first month, and after about one month, after the adaptation period, they will begin to change significantly.

Suggestion: Keep fit regularly. Considering the thin figure, eat more protein food.