Primary muscle
legs
Equipment
machine
Secondary muscles
glutes
Sit with your back and hips flat against the pad, feet shoulder width on the platform. Release the safeties and lower the platform under control until your knees reach roughly 90 degrees or slightly deeper. Press back up without locking the knees out hard at the top. Keep your lower back in contact with the pad throughout. If your hips start to curl off the seat at the bottom, you have gone too deep. Common mistakes: lifting the hips off the seat at the bottom, and slamming into full knee extension.