Sit Up Punches - engage overall abdominal strength
To perform sit-up punches, begin in a lying position on the floor with your knees bent. Crunch your abs upward, aiming to touch your knees or thighs, taking care not to strain or pull on your neck. While in the lifted position, release one of your hands and punch it toward the opposite knee. Return the hand back down and repeat the punching motion on the opposite side.