Um ... I will keep running every day and see how and how much you run. If you practice sprinting many times, you may have hard muscles. If it's a middle-distance race, you can still lose your leg after relaxing (you can't sit or squat immediately after running, you should relax while walking). Running is the best way to exercise, which can exercise the whole body. If you insist on it every day, it will be good for your health.