When a body strike is inevitable, "roll the body with the strike," which means rotating the body in the same direction the attack is traveling. This increases the time of the impact (the time the fist is in contact with the body), which causes a change in momentum (impulse) and decreases the striking force.
An alternative is to move your body toward your opponent and jam the opponent’s weapons, similar to a boxer's clinch. If you can catch your opponent in a moment of off-balance, the movement may knock him or her down.
Protect your vulnerable areas, such as liver, kidneys, and groin by shifting less vulnerable areas, such as shoulders, arms, or fists into the trajectory of the strike. The centerline of body contains the most vulnerable areas, such as nose, throat, solar plexus, and groin, so always keep the centerline turned slightly to the side to protect it. Keep your elbows tight to your torso to protect your ribs.