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No thanks! From http://www.thedailybeast.com/newsweek/blogs/the-human-condition/2009/06/03/stop-doing-sit-ups-why-crunches-don-t-work.html : “We stopped teaching people to do crunches a long, long time ago,” .... That’s because the “full flex” movement—the actual “crunch” part of crunches – puts an unhealthy strain on your…
