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30 day plank challenge core exercise - refinery29, A strong core foundation strong body. : tree fall trunk solid stable. core work . http://www.refinery29.com/how-to-do-a-plank 30 day plank challenge - youtube, Day 1 - 20 seconds day 2 - 20 seconds day 3 - 30 seconds day 4 - 30 seconds day 5 - 40 seconds day 6 - rest day 7 - 45 seconds day 8 - 45 seconds day 9. http://www.youtube.com/watch?v=Hwo1qGnyIUI 30 day pilates plank challenge - skinny ms., Get ready walk plank! achieve total body toning pilates plank exercises, emphasis core strength stability. gain balance condition. http://skinnyms.com/30-day-pilates-plank-challenge/