I swapped my standard plank for a plank pass-through – here’s 6 reasons why you should too

I’m not sure I'll go back ...
Yahoo

I did 90 plank drags every day for a week — here’s what happened to my abs

Ah, plank drags. As I ventured into yet another plank challenge, mentally and physically prepared for seven days of sore core muscles, I wondered one thing — why? It’s a good question. At Tom’s Guide, ...