Is it? You don't need 100 pushups to build muscle. At a certain point you are well overdoing it, and definitely not doing your joints any favors. So why do it?

Is it? You don't need 100 pushups to build muscle. At a certain point you are well overdoing it, and definitely not doing your joints any favors. So why do it? Overtraining is a real thing, and this person is doing it. Either that or they're embellishing to make a point.