Add Yahoo as a preferred source to see more of our stories on Google. How to do the perfect side plank, and how to make it easier (and harder). Planks are hard. Even just 30 seconds in plank position ...

Vanilla ice cream, a plain cheeseburger, that little black dress-sometimes keeping it simple is actually the most satisfying. That goes for the core move youve probably done in almost every workout ...

Why one trainer calls the plank variation "no joke." ...

A staple of many core workouts, most runners will be familiar with the side plank exercise. But you may be surprised to learn that it's one of the best exercises you can do for working your deep core.