Weighted overhead crunch (on stability ball)

How to do it

1. 1Sit on a stability ball with your feet flat on the ground and your knees bent at a 90-degree angle.
2. 2Hold a weight plate or dumbbell with both hands and extend your arms overhead.
3. 3Engage your abs and slowly curl your torso forward, bringing your chest towards your knees.
4. 4Pause for a moment at the top, then slowly lower your torso back to the starting position.
5. 5Repeat for the desired number of repetitions.