Sissy Squat Mistakes to Avoid
Bending at the hips — the torso and thighs should stay in a straight line. Hip bending turns it into a squat. Keep the line from knee to head straight.
Heels on the ground — rise onto the balls of your feet. Heels down changes the mechanics entirely.
Attempting without support — hold something for balance until you master the pattern. Freestanding sissy squats require exceptional balance.
Going too deep too soon — the bottom position puts extreme stress on the knee tendons. Build depth gradually over weeks.
Sissy Squat Muscles Worked
The sissy squat isolates the quadriceps through knee flexion with the torso leaning back, removing all hip extension. The rectus femoris (the quad head that crosses the hip) is loaded maximally. It's the closest thing to a bodyweight leg extension.
Sissy Squat FAQ
Why is it called a sissy squat?
Named after Sisyphus from Greek mythology — who was condemned to push a boulder uphill forever. The exercise mimics the backward lean of pushing something heavy forward. Nothing 'sissy' about it — it's extremely difficult.
Are sissy squats bad for knees?
They put significant stress on the knee joint and patella tendon. If you have healthy knees and build up gradually, they're safe. If you have pre-existing knee issues, stick with leg extensions instead.
Do I need a sissy squat machine?
No — you can do them holding a rack or wall. A sissy squat bench locks your feet in place, which helps with balance and allows hands-free reps. Nice to have but not necessary.
How do sissy squats compare to leg extensions?
Same primary muscle (quads in isolation). Sissy squats are bodyweight and train through a larger range with more stretch. Leg extensions allow precise loading. Both are excellent quad isolation exercises.