I love the clamshell exercise, too. I do this simple movement on the floor, from the comfort of my yoga mat (or carpet), and it's done more for my hip mobility, core stability, and glute (buttock) ...

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 ...

A physical therapist explains how a modified side plank with a clamshell strengthens runners’ core and hips to improve efficiency and reduce injury risk.