Just in case, check several places, knee joint, press or knock with your hand, and see a doctor if you feel swollen;
The knee joint is higher (between the knee joint and thigh muscles) and belongs to the tendon. High-intensity exercise may also hurt a little. It should hurt when pressing, but if it hurts too much, it is recommended to go to the hospital.
The thigh muscles will hurt whether they are slapped or forced. Muscle strain is certain, but generally nothing will happen.
This kind of exercise is no good. You can't eat a fat man in one bite.