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How To: Plank - YouTube
http://goo.gl/X8HeL5 FULL 12 WEEK MUSCLE BUILDING 4 ...
Planks for Beginners: How to do a Plank - YouTube
Check out more Bowflex workouts here: https://goo.gl/jkjFMm The plank is a great core exercise that doesn't involve doing any crunches. In fact ...
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