http://AskTheTrainer.com/bosu-ball-exercises.html
Just another way to progress the plank. If you participate in a sport or event where lateral stability is important this is a great exercise to improve your lateral core stabilization.
If you have unstable weak ankles you may have sprained in the past you can put your toes in the stability ball which will help you improve ankle stabilization.
San Francisco Personal Trainer Mike Behnken, MS, CSCS
http://AskTheTrainer.com/stability-ball-exercises.html
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