http://AskTheTrainer.com/bosu-ball-exercises.html
Personal Trainer Michael Behnken, MS, NASM-CPT-PES, CSCS
The BOSU lower back crunch is a good lower back exercise.
Do not use this exercise if you have a predominant lower back arch associated with anterior pelvic tilt.
Make sure you keep your core drawn in tight and your glutes squeezed.
San Francisco Personal Training
http://fitSF.com
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