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Instructions
Preparation
With dumbbell in hand, sit on stability ball. Roll body down and lie with back on ball, hips nearly straight, and feet apart on floor. Hold onto dumbbell with both hands with arms extending straight upward.
Execution
Turn torso to one side while keeping arms straight and perpendicular to torso throughout movement.
Return dumbbell back over shoulders by rotating torso to original position. Continue lowering dumbbell to opposite side. Repeat.
Comments
Both arms should be kept straight and perpendicular to torso. Hips should also be kept nearly straight, only slightly bent.
This movement involves both spinal rotation and hip external rotation. Because leg to the opposite side of dumbbell acts to counter weight of dumbbell's resistance, greatest downward force onto floor is place on foot nearest side of dumbbell. Since foot of near leg provides more secure base of support, external rotation of near hip provides significantly more torque as compared to relatively passive internal rotation of far hip.
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