Why is good form so important during exercise?

Good form is KEY. In any exercise, any sport, essentially any physical activity, form, stance, addressing the object interacting with, leads to the desired results --without injury--more than any other factor. Ask any athlete: how does a petite lady hit a golf ball 280 yards, how does a pitcher with just average muscles strength throw a 100 mph ball? It goes beyond that: communication is more form than words.