It would be easy if the school had parallel bars and horizontal bars. Do parallel bars once every two days;

(a) the horizontal bar pull-ups, once every two days, each time four groups, each group of 5 to 10 (if there is no horizontal bar, you can use basketball stands or other substitutes as the horizontal bar).

(2) The parallel bars are supported by arms once every two days, and each group is 8 to 12 (if there is no parallel bars, two chairs can be used to imitate the parallel bars back to back).

(3) Play basketball, volleyball, football and sit-ups on the day when you don't do parallel bars.

(4) Strengthen nutrition, pay attention to rest, get enough sleep, and be optimistic and confident.