Every martial artist seeks to defeat their opponent in combat.
But at what price?
Blocking, struggling, forcing, striking a balanced opponent... these are also harmful to your own body.
In defeating your opponent you may also harm yourself.
If defending your own body results in injury to your body, is this success?
Have you not failed in your intention?
Bruises, sprains, stiffness, soreness, cuts and damage are all bad for you.