To begin, stand up with a dumbbell held in each hand. Feet should be about shoulder-width apart. Lift dumbbells overhead until both arms are fully extended, the palms of the hands facing up toward the ceiling.
Keeping your upper arms close to your head with elbows in and perpendicular to the floor, lower the dumbbells behind your head.
Press back to the starting position by using the triceps to raise the dumbbell. Exhale as you perform this step.