cable russian twists (on stability ball)

Sit on a stability ball with your feet flat on the ground and your knees bent at a 90-degree angle. Hold the cable handle with both hands and extend your arms straight out in front of you. Lean back slightly while keeping your back straight and your core engaged. Twist your torso to the right, bringing the cable handle towards your right hip. Pause for a moment, then twist your torso to the left, bringing the cable handle towards your left hip. Continue alternating twists for the desired number of repetitions.