No Intensity, No Results by Andréa Maria Cecil
To move all significant health markers in the right direction, do more work faster, trainers say. The only way to know intensity is to experience it. It is not a mythical creature born of grunting loudest, sweating most or cheering excitedly. It is also not a matter of opinion. It’s physics. Scientifically speaking, intensity is defined as power: force multiplied by distance, then divided by time. Simply put: Intensity is doing more work faster. “You have to teach people how to do it,” said Chris Spealler, a member of CrossFit Inc.’s Seminar Staff and a seven-time CrossFit.
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Understanding CrossFit
Explanation of Crossfit by Greg Glassman himself. From 2007, but the main principles of the training didn't change since then.
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