Pull-in (on stability ball)

Start by sitting on the stability ball with your feet flat on the ground and your knees bent at a 90-degree angle. Place your hands on the sides of the stability ball for support. Engage your abs and slowly roll your hips forward, bringing your knees towards your chest. Pause for a moment at the top of the movement, then slowly extend your legs back to the starting position. Repeat for the desired number of repetitions.