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This exercise involves knee and hip flexion. The range of motion is split between the hip and the knee. It requires both strength and balance.

Hold DB on the opposite side of the leg you will be working.
Balance on one foot, with the other just slightly behind.
Think about sticking the butt and chest out to achieve a tight upper body, not hunched or curved.

Tilt forward from the hips and flex the knee so that you bring the DB just to the front of the foot.
The upper body should be flexed forward, but not as far as a straight leg dead lift.
Pivot from the hips and push off your heel to return to start.