You can go to the gym three times a week (after school on Friday, Saturday and Sunday), and you can exercise on the playground after school on normal school days. At that time, all our senior high school students teamed up to exercise on the playground. Of course, you can also finish your homework and go to the park near your home. Personally, I think outdoor exercise is better, and the air is fresh. The equipment in the gym is more professional, so you don't have to go every day. You can take the time to check whether your usual training has improved.
Besides exercise, you should also pay attention to your diet. You can't skip breakfast just because you are pressed for time in the morning, so I won't go into details.