Instructions

Lie with your back on the floor and legs out straight. Grasp hold of a dumbbell in each hand, with your arms locked out above your chest and palms facing each other. Bend your elbows until the dumbbells are close by your head, then "roll" them so that they are lying flat against both sides of your head. Reverse the motion by rolling the dumbbells back up and extending your elbows until your arms are again straight above your chest.