
Narrow-Stance Barbell Squat
Quads, Glutes


Legs / Beginner / Compound (multi-joint)
A machine leg press with the feet close together on the platform that emphasizes the quads.
Loads the knee. Use a load you can control and skip it if it causes pain.
Why it hurts: The pelvis tucks and the lumbar spine flexes under heavy load, a common cause of disc injury on this machine.
✓ Instead: Stop the descent before your tailbone lifts. Keep the lower back pressed into the seat.
Why it hurts: Locking out under a heavy sled loads the knee joint passively and can hyper-extend it.
✓ Instead: Stop just short of lockout with a soft knee.
How specific this exercise is to each movement.
Illustration: Everkinetic (everkinetic.com), CC BY-SA 4.0.