CrossFit athlete Katrin Davidsdottir has always had a six-pack, but her core wasn't always strong. The former Fittest Woman on Earth said neglecting her core led to a herniated disc. Davidsdottir now ...

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 ...

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.

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.

While the standard plank is widely incorporated into core workouts, the side plank is often overlooked. This variation of the plank targets the obliques, the muscles that run along the side of your ...

Once you’ve mastered forearm planks and side planks — two staple variations of the ab exercise — it might be time to take things up a notch with side plank dips. This combo core move challenges your ...