Start by standing tall with your feet about hip width apart, chest up, and shoulders down. There should be a slight bend in your knees. Hold a pair of dumbbells on the front of your thighs with your palms facing your body.
Initiate the movement by moving your hips back. Keep the slight bend in your knees the entire time. You should feel a stretch in your hamstrings as you reach the bottom of the movement.
As your hips move back the dumbbells should stay close to the front of your legs. Once you feel a good stretch in your hamstrings, reverse the motion by contracting your glutes and hamstrings. Extend your hips and stand up, returning to the starting position.
Your back should be flat, chest up, and shoulders down the entire time.
Reset at the starting position and repeat for given reps.