Keeping elbows bent, raise the dumbbells back above your chest again, then repeat.
How-to: Lie on a bench or the floor with your knees bent. Hold the dumbbells directly above your chest, with palms of hands facing each other. Lower the dumbbells in a slow arc to your sides, bending elbows as far as feels comfortable (or until they touch the floor, if you’re not using a bench). Keeping elbows bent, raise the dumbbells back above your chest again, then repeat.