Hold a dumbbell firmly in each hand between your legs. Feet should be hip width with your toes turned out. Brace your core and keep your chest up. With a slight bend in your knee, proceed to hinge your hips back, swinging the dumbbells back as you do so. Inhale as you do this and be sure to keep a neutral spine. When your hips have hinged as much as possible, proceed to reverse the movement with force and swing the dumbbells back between your legs and in front of you while exhaling. Squeeze your glutes at the top of the movement. Repeat for the required number of reps (or time).