Strong shoulders and lats add to punching power. Speed adds to power...hence the old physics formula "Mass x Accleration = Force." The faster you move or the more snap the harder your whack. Just look at Bruce Lee...138lbs...but he'd knock you into next week if he hit you...hence his one inch knock out punch. Form...the better your form...the more you'll use your whole body to deliver the shot. Getting your legs into will help also; especially hooks and uppercuts.
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