Do it yourself in the room, push-ups and do it in groups! If you want to practice two heads again, you should bring your luggage or schoolbag when you go out, and do it up and down with your schoolbag on your back, which is also a group. Also, if the floor of the room is clean and not cold, find a cupboard, put your feet in it and do sit-ups. In fact, you can take exercise with you. The grouping mentioned above depends on your own situation, and it is recommended to do what you can! Hope to adopt!