The main reason is that college students' life is rather lax now. They usually don't pay attention to exercise and often stay up late, which leads to worse and worse physical fitness, so they will be very scared when they have a physical examination.
When you are free at school, you can go running in the playground. If you think it's too hot or the sun is too strong, you can go for a walk on the playground in groups after dinner.
In addition, when you go to physical education class, you must be serious and not be lazy. When the teacher asks you to do warm-up exercises, you must follow them carefully and run after you finish. Every time I went to physical education class before, some students would ask for leave from their teachers for various reasons because they didn't want to run.
Actually, I don't think it's necessary at all, because there are only two physical education class festivals a week. I don't exercise at school at ordinary times, but it's good to go to physical education class for exercise occasionally.
Some students will buy a yoga mat in the dormitory, and then search for videos of practicing yoga online and do it together. But I think this method is limited to the first floor, because if you live upstairs, it is very likely that yoga will affect the students downstairs.
Besides, some students may be less nervous about college courses. Basically, there is only half a class every day, and the rest half a day is spent playing badminton or table tennis with roommates outside, which not only helps to exercise, but also effectively increases our physical fitness.
Especially in summer nights, you can go running in the playground. It's not long, just run for half an hour to 40 minutes at a time.