Cobras on a yoga ball involve lying prone on the ball with your abdomen centered on top. With your hands on the ground for support, slowly roll forward until your hips are slightly off the ball, and your legs are extended behind you. Engage your core and lift your chest and upper body off the ball, extending your spine while keeping your gaze forward. Hold the lifted position briefly, then lower back down with control, allowing your chest to return to the ball. This exercise strengthens the muscles of the back, shoulders, and core while also improving spinal flexibility and posture.