Exercise Instructions
Step One
Lay on on the floor with the ball positioned in the small of your feet.
Step Two
Keep your knees bent to 90 degrees. Cross your arms over your chest.
Step Three
Lift one shoulder and trunk upward, slightly twisting your trunk. Hold and slowly return.
TIP:
Don't let the ball move under your feet.
VARIATION: Change the position of your hands to behind the head to increase the challenge.