The single leg alternate arm reach to floor strengthens your hip abductor muscles, providing increased strength and stability of your pelvis, while simultaneously working on improving your balance.
Begin in a standing position.
Bend forward from your hips as you extend one leg behind you and bring your arms out to the sides like a windmill. Your standing knee should be slightly bent. Reach toward the floor with one hand to a point just in front of the toes of your standing leg. Now reach with the other hand to the same point. Continue alternating arms.