he real exercise equipment for your quads.
Sissy squats when done right will add strength, size and mobility to your quads better than almost any other exercise. Sissy squat also demands and develops mobility in the ankles, lower back and many of the hip muscles (stabilization). If you do sissy squats without support, you will also develop coordination and balance.
While the basic back squat has a reputation as the World's Best Exercise, it earns that rep by working your posterior-chain muscles at least as much as your quadriceps.