7 Ways to Make Planks Harder

Unterarmstütz und Core-Training - Make it harder:

"Standard planks? Been there, done that. Try these awesome variations in your next workout....."  

Womens Health / Direktlink: http://www.womenshealthmag.com/fitness/plank-exercise?cm_mmc=Facebook-_-womenshealth-_-content-fitness-_-HardAbsWorkout

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