Page 62 - Complete Krav maga : the ultimate guide to over 250 self-defense and combative techniques

2 As your hand is about to strike the target, flex your wrist backward, open your
hand, and curl your fingers slightly, making contact with the hard surface at the
base of your hand. Rotate your wrist inward as you strike—this adds extra power

and helps protect your wrist. By moving your fingers out of the way, you force
the heel of your hand, rather than your fingers, to make contact. If you don’t
rotate, your wrist may be bent backward on impact, potentially causing a sprain
or break.