Considering the background of the author, you can be assured that Crunchless Core program has its basis rooted in scientific knowledge. This is a detailed, comprehensive workout that actually helps build your core from scratch, and it does so with functional training. The author also understands the importance of diet in promoting overall fitness. Thus, the program also promotes healthy eating and not just calorie restriction.
http://www.youtube.com/watch?v=bj-xvKOl_WQ
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