http://AskTheTrainer.com/best-ball-exercises.html
The Swiss, Physio, or Stability Ball plank a basic, but intense core exercise.
Never let your pelvis be anteriorly rotated during this motion.
Keep your Butt squeezed and your core drawn in. If you cannot maintain the correct posture, Regress to the floor plank.
San Francisco Personal Training
http://fitSF.com
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