https://youtu.be/Ly71LeprFKQ
The pistol, or single-leg squat, is a unique exercise that combines strength, flexibility, and grace in a manner unlike many other movements.
Level 1 High Box:
Stand on one leg on the floor and sit the hips back in a squatting position until you lightly touch the top of the box.
Level 2
Low Box
Level 3
Weighted