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) ...
A physical therapist who designs programs for elites reveals the most common running weaknesses and the exact strength ...
Give these five exercises a try if you're interested in strengthening your hips and knees. They include banded clam shells ...