Swiss ball hamstring curl
Back of thighs and buttocks
How to do:
- Start lying on your back, feet up on a Swiss ball.
- Raise your hips as high as you can towards the ceiling, then bend the knees and curl the ball towards you.
- Slowly return to the start position before repeating.
Beginner: 3 x 10 reps
Intermediate: 4 x 10 reps
Advanced: 5 x 10 reps