While seated, place both feet on the foot plates and your back against the pad. Extend the legs until the posterior thighs are against the seat. Check hop joint alignment with the pivot point. Adjust the foot plate to properly align the hip while maintaining contact of the thigh against the seat. Stabilize this position with the belt. Press against the back pad and slowly extend the hips while keeping your back straight. Control the return forward without resting.
Here are a few suggested alternative exercises:Back ExtensionBall Rise and ShineDumbbell DeadliftDumbbell Good Mornings