Reverse hyperextensions on a yoga ball begin with you lying prone on the ball, your hips and lower abdomen centered on top. Extend your legs straight behind you and hold onto a stable surface for support. Engage your lower back and glute muscles as you lift your legs towards the ceiling, aiming to keep them straight throughout the movement. Hold the top position briefly, then lower your legs back down with control to complete one repetition. This exercise targets the muscles of the lower back, glutes, and hamstrings while also improving core stability and balance.