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30 day plank challenge core exercise - refinery29, Get results quickly 30-day plank challenge.. http://www.refinery29.com/how-to-do-a-plank The 30-day plank challenge - conscious runner, The 30-day plank challenge 30 day plank challenge! awesome! day, 30 days, planking. day time spent. http://www.consciousrunner.com/PlankChallengeSEPT012014.pdf 30-day plank challenge - fabfittraining., How plank hold: 1. start pushup position, forearms ground hands. 2. elbows line . http://www.fabfittraining.com/wp-content/uploads/2014/01/30-day-plank-challenge-.pdf