Punching is not pushing. When you throw a punch- a power punch like a hook or a right hand- the power is generated from the ground up first by shifting the body wt from one leg to the other and keeping the leg straight in ordeer for that side of the body to serve as the 'hinge side'. Not to push my own posts but I put one up a week or so ago entitled 'Hitting' that explains the idea behind leverage etc...