This exercise use a Stability Ball instead of a bench. The Stability Ball conforms better to your body and allows for correct anatomical range of movement.
EQUIPMENT
Exercise Ball, Weight Plate
PRIMARY MUSCLES
Obliques
SECONDARY MUSCLES
Lie one side of your torso, and with your waist and hip against a Stability Ball, position your feet on the floor (or against a wall) for support.
With one hand, hold a weight against the side of your head.
Place your free hand across your chest to steady yourself.
Raise your torso up off the ball by flexing your waist.
With controlled movements lower yourself back onto the ball.
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