In fact, you don't have to be a muscular man when you are a student, but your muscles must be strong, because not many people like muscular men.
Similar to the answer upstairs, because muscle exercises are all like this, I can get a fitness card if I can, and food and meat can grow more muscles. I belong to a thin man who won't gain weight.
On the school playground, first jog to warm up, then run at a medium speed immediately, until there is no severe asthma but you have to survive, and then jog to recover. The point is that your legs must stride. It will be difficult to get through it, but it can be slower. This is the basis of exercising leg and vital capacity endurance, and it is also the basis of later exercise.
Then, jump frog or squat, these must make your legs weak, walk a little and do push-ups. My practice method is to lift my legs 1 meter, which can be a step or a hard core. You must lift your legs. I usually divide them into groups of 4 to 50 people. After a group, I will bounce and kick, because I don't know if I can actually exercise my muscles. There are many ways to do this. Lie flat, raise your legs and head at the same time, pause for 3 seconds and slowly put it down. Be sure to be slow. The quantity is up to me. I usually do 30 times, and then continue the push-ups. Of course, you can pull-ups and exercise your back muscles.
The overall time is between 1 hour and 2 hours, with a short break. Of course, if you still have the ability to do push-ups and jump in place, you can do five standard push-ups, then stand up quickly, jump five times in the air, and then do dozens of groups. This is to exercise endurance and explosiveness.
Pure hand tour, boring to pass the time, feel good can give points.
Of course, there are many ways, and there are many places where you can practice your muscles. Mainly because I am fat, I can't practice. Take a break and go on. Time should not be too short, and certainly not too much.