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Sit on the floor with your upper back against a bench.
Roll a barbell (or place a weight) over your hips.
Bend your knees with feet flat on the floor, about shoulder-width apart.
Brace your core and drive through your heels.
Lift your hips until your torso and thighs form a straight line.
Squeeze your glutes at the top for 1–2 seconds.
Lower your hips under control and repeat.