http://AskTheTrainer.com/bosu-ball-exercises.html
Personal Trainer Mike Behnken, MS, NASM-CPT-PES, CSCS
While you perform push-ups make sure not to lose your drawn in core and let your back arch.
San Francisco personal training
http://fitSF.com
Michael Behnken, MS, NASM-CPT-PES, CSCS
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