Push-ups are in groups of 30. If you can do more, you can increase the load. Can exercise chest muscles and arm strength. Sit-ups can be done in groups of three for one minute at the fastest speed. You can also exercise abdominal muscles. There is also in-situ high jump, that is, you can exercise bouncing and abdominal muscles to play basketball. Even this is good for high school students. It's enough to keep learning so much.