normally i don't think you would want to purposely use the middle or lower part of your shin for something like a low leg kick. Many a fighters shin bone has been snapped after a blocked kick in this fashion. But i was thinking that during a roundhouse to the body, to a vital area just below the ribs and above the waist would be optimally effective if using the lower part of the shin bond just above the ankle, as opposed to the crease/bend in the top of the ankle. That lower part of your shin bone won't break when hitting a softer surface and it seems like that would cause much more damage. anybody have any comments on various parts of your leg/shin you would use for various kicks to specific areas so as to maximize effectiveness and minimize damage to yourself.