Benefits of Plank Exercise:
https://scontent-b-dfw.xx.fbcdn.net/hphotos-frc3/p200x200/1377171_605107956197907_1470013895_n.jpg The 30 Day Plank Challenge will send your core strength through the roof! Yes, all you have to do is HOLD this position, nothing else! It looks pretty easy, but it isn't! You want the same form as shown in the picture - you…
