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) ...

ANY BIG TIME squat or deadlift day needs a big, similarly multi-joint movement to get ready, right? In reality, going small and simple—in this case, targeting your glutes with the clamshell ...