Hold a dumbbell in each hand (or a kettlebell in both) and lift your left foot slightly off the ground.
Keep your back neutral and lean your entire torso forward while raising your left leg, which should stay in line with your body. The dumbbells will lower toward the ground. Keep your left shoulder blade pulled down your back.
With your back straight, return upright, coming to your starting position. This completes one rep. Maximise this move by keeping your left foot off the ground as you move through your reps.