Boxing power utilizes the same basic mechanics as throwing a football:
"You engage up to about 50% of your mass throwing a shot like your hook. Again, your technique plays a big role in how much mass is involved in your power punch. The way the body mechanics works is by recruiting a chain of various body movements to transfer momentum (energy) to your point of contact. You generate movement from the legs, the torso, arms and whatever component of the body that generates momentum as part of the motion in your technique. All the energy from those components combines and transfers by kinetically linking all the momentum to the opponent. You’ll get a good component of momentum generated from the legs initially, but a large bulk of the mass comes from your torso as you pivot it in an angular trajectory (twisting motion). Recall that Force = mass * acceleration. Elite fighters like Pacman have an average punching velocity of around 12 meters/second, so what’s left is the mass, which usually depends on your body type and the technique to optimize it. Guys you mentioned like rumble have a larger upper body mass, which when rotated about the axis of the spine, generates a lot of power."
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This is similar to the process of how a NFL QB throws a good football. He generates movement in his legs and torso, before uncorking the ball in a whipping motion, which is calculated by Force = mass*acceleration.
