FLEX YOUR FUNK! The hip flexor is a group of muscles that move your legs to and from your body. You use them when you march, walk, run, balance, stabilize, and even dance. Chubby Checker couldn’t twist without them. They control propulsion, the forward movement of your walk; medial and lateral stability, balancing the body side-to-side on legs; and postural control, the tilt of the pelvis and low spine. So, how do you keep your hips flexing and your inner Checker twisting? Ke