This exercise improves strength of the hip and leg while also challenging balance and stability.
Begin standing with your feet hip width apart and arms out to the sides. Shift your bodyweight until you are balancing on one leg with your knee slightly bent.
Hinging at the hips, slowly lean forward reaching your free leg straight back behind you while that same side hand reaches towards the floor. Then slowly return to the starting position.
Keep your back straight and your core engaged.