i think you will do push-ups every day-so it will be repetitive exercise( it will make a damage) why to make a damage while you can grow nice pecks and triceps. if you fall once from the stairs it won't make big damage LOL. But think if you going to do it by your will every day it will do plenty of damage. You NEED!!!!! to make research of any exercise if you starting any training routine. women do with wide elbows, because their pecks and triceps are very weak, so they must build strength in those muscles before starting the push-ups routine