Well, yes but I don't mean that. Even if you can do push ups or any other exercise with your body weight, there are some muscles that you can't exercise. Legs

Well, yes but I don't mean that. Even if you can do push ups or any other exercise with your body weight, there are some muscles that you can't exercise. Legs are extremely complicated to work out without weight. They carry your whole weight around all day so in order to make it suffer a bit, you need to add something on top of that. You can't do biceps or any other small muscle that needs to be isolated during the workout.