For this one, you’ll need one of your lighter dumbbells. Lie on your back, knees bent, arms raised above your chest, holding the dumbbell in one hand. Keep your elbows slightly bent and pointed out toward the sides and open them up out to the sides as if you’re hugging a very large tree. Raise your arms back up to center and hand the dumbbell off to the other hand. Count each handoff as a rep.