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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 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 Plank challenge: master plank - goodtoknow, You heard plank, effective exercise ? demonstrate tone plank 30 days!. http://www.goodtoknow.co.uk/wellbeing/545572/the-30-day-plank-challenge