Instead of performing a pistol squat, lean your torso slightly forward and hold your non-weight bearing leg behind you instead of in front of you. I call it a single-leg knee tap squat.

The pistol squat exercise isn't bad exercise, but the knee tap squat puts you in a position that better reflects how you perform a squat, as well as how you move in life and sport.

Related:  7 Single-Leg Exercises You've Never Tried

Related:  7 Smarter Exercises for Delts, Abs & Legs