In addition to the excellent answers others provided about the muscles working together to power a punch (for more reading, look up *kinetic linking*), boxers also have good back muscles because they need to move their torso fast to avoid their opponent’s punches.
Standard defenses include slipping (leaning a bit to the side), bobbing (ducking a bit) and weaving (leaning more to the side), which use all the torso muscles extensively, as well as the legs and head.
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