Psoas Major, Rectus Abdominis
- Start by lying on your back with your arms out at your sides and an exercise ball held up about 12 inches (30 cm) off the ground between your feet, your legs straight. Keep your arms extended and palms flat on the ground. This is your starting position.
- Slowly move your legs as far as you can to one side keep the ball held between your legs.
- Slowly return to the starting position and repeat on the other side.