Stand with dumbbells in your hands. Lean forward at the hips until your upper body is at a 45-degree and your knees are bent. While you keep your upper arms still and close to your sides, straighten your forearm behind you until they are parallel to the floor. Return and repeat.
We love these adjustable dumbbells from Rep Fitness. They take up very little space and are also very durable compared to other adjustable dumbbells on the market.