Single-leg deadlift on a half ball with weights

Stand on one leg on a Bosu with the flat side up.
Hold dumbbells in both hands, arms by your sides.
Find your balance.
When ready, bend forward from your standing leg hip, whilst keeping your back long.
At the same time, straighten your other leg backward trying to keep it in line with your trunk and lower the dumbbells toward the floor.
Then return to upright, hold your balance and repeat.