Exercise:  The Abdominal Crunch with Ball 

STARTING POSITION ENDING POSITION HELPFUL TIPS
  1. Start with heels  planted flat on the floor.
  2. Lift shoulders slightly up so as to engage your abs.
  3. Lift shoulders and torso a bit higher.  Hold and then slowly release.
  4. To make the exercise easier, widen the stance of your feet.  Do the opposite to increase the difficulty.

Level of exercise:    Intermediate/Advanced