1-ARM BALL CRUNCH
Holding the ball in one arm will force the shoulder to stabilize itself and force the abs to control the motion of the body, leading to more time under tension and therefore more muscle.
DIRECTIONS: Lie on the ground and hold a medicine ball directly over your chest in one hand. Lift your legs until they are almost perpendicular to the ground. Flex your abs and reach the ball up towards your toes without letting the ball fall out of your hand. Slowly let your torso down towards the floor. Repeat on the opposite side.
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