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.
Step Three
Cross your arms over your chest and lift your trunk upward until your shoulder blades come up off the floor.
Step Four
Hold and slowly return.
TIPS
Don't let the ball move under your feet.
Variation
Change the position of your hands to behind the head to increase the challenge.