This simple bodyweight exercise is transforming routines across the U.S. by delivering full-core activation in less than a minute.

Planks, which have elements of Pilates, yoga, and stretching, require little space. They strengthen your core and help you burn a lot of calories. All planks involve keeping a straight line from your ...

Add Yahoo as a preferred source to see more of our stories on Google. YOU KNOW THE SAYING: Work smarter, not harder. You may have already incorporated that mentality into your training routine, ...