Stand holding a dumbbell in each hand in front of your hips, with your feet hips-width distance apart, and your bodyweight shifted to your left foot. Step your right foot 10 inches behind you, and rest your toes on the ground as a kickstand.
Point your feet straight ahead, and bend your back knee slightly. Inhale to stand tall, and as you exhale, engage your core.
On an inhale, hinge (bend) at your hips as you lower the dumbbells toward your left foot, keeping the dumbbells close to your body. Only lower the dumbbells until you feel a stretch in your left hamstring — you shouldn't feel pain. Be sure to keep your back flat throughout the entire movement.
Exhale as you keep your back flat, engage your glutes, and stand up. This completes one rep.