PASS THE BALL
- Place a Swiss ball between your ankles and grip it with your legs.
- Switch your abs on before starting every rep.
- Bring your legs and arms up, passing the ball form one to the other and lowering it overhead.
- Repeat the process, heading the other way.
- If you find holding the ball tricky (some gyms only have massive ones), this is still an effective exercise if you remove it completely and mimic the movement pattern anyway.