Un-rack a barbell and hold it against the top of your back. Stand tall with your feet hip width apart, a slight bend in your knees, and chest up.
Keeping your back flat and core tight, move your hips back. As your hips move back let your torso come forward toward the floor while maintaining proper posture.
Continue to control the descent until you feel a stretch in the back of your legs or your torso is close to parallel to the floor.
Reverse the motion by contracting your glutes and hamstrings, while keeping your back flat, and stand up tall.
Pause and repeat.