What about the parallel bars? That's not good. Do it every day! Pull-ups!
Exercise leg muscles and do squats. Keep breathing well!
This is how I build my muscles. I was in high school. I was 19 years old. I have been doing this exercise for three years. It's all muscles. The students are all envious. If I exercise according to my method, I can build a lot of muscles in one semester! It will be obvious! If you feel tired, you can do less! 2-4 times a week is enough, and more is better.
Typing hands are sore, give it to me!