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The one exercise you need to stop immediately

 
Posted August 6th, 2014 @ 7:15am

Here's why crunches don't really work that well and are actually dangerous: Imagine your spine is a credit card. In the same way that repeatedly flexing and extending a credit card will eventually lead to wearing out of the card, repeatedly performing the crunching motion can put a lifetime of damaging strain on your back.

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