Planks suck and this one is the worst. The Copenhagen plank is a variation on the toughest part of your mat Pilates class: the already notorious side plank. This version specifically targets the ...

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.

Strong hips and glutes are a must if you want to run well – so if strengthening these areas is one of your goals, be sure to add the clamshell exercise to your strength training routine. The ...

Anyone who spends a lot of the day sitting could probably stand to strengthen their glutes. And the clam shell exercise is an excellent way to do just that. But it also offers a whole lot more. This ...