If you’ve ever tried them, you know side planks are challenging­—even more than regular planks. But they’re a critical move, says Keli Roberts, an exercise physiologist with the American College of ...

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.

Fitness fads may come and go, but there’s one aspect of strength training we can all agree on: a strong core never goes out of style - and for this, I'd recommend the side plank exercise every time.