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Laying on your back, place your legs up on a physio/swiss ball. The closer the ball is to your knees the easier it will be, the closer to your ankles the harder it will be. You may keep your arms down on the ground to help your core, or you can cross your arms to make it more challenging.

Cross one ankle over the other. Then, brace your core first, then squeeze your glutes and straighten your knees as straight as they will go. Then squeeze your glutes more to bring your hips up off the floor. Be sure to not arch your back to assist lifting, and keep your knees straight to ensure your hamstrings do not help also.

Hold at the top, then slowly return to the ground; be sure your glutes are doing the work throughout the entire movement.