As a member of the Naval Special Operations Force developing the entire anterior core for optimal joint alignment and function was crucial. Nothing they did was for solely cosmetic reasons, although they developed lean and muscular bodies as a byproduct.
Craig explains why sit-ups and crunches can be dangerous and shares some of his favorite exercises for helping to achieve a tight, well-balanced midsection, along with the sought after six pack.
You have no reason to do situps or crunches ever again .and your spine will thank you.
READ HERE - Situps Are Dead