Sit up straight with your legs extended and roll a barbell up to the crease of your hips. Lay back into a supine position on the floor with your arms holding onto the bar. Bridge your hips up by squeezing your glutes and driving your heels into the floor. Lower your hips back to the starting position and repeat for the desired number of repetitions.
Use a pad on the bar for comfort. Keep your lower back neutral, squeeze the glutes, and aim for a straight line from knees to shoulders at the top. Exhale as you lift, pause at the peak, and make sure you feel the work in your glutes, not your lower back.