Pelvis

With every step you take, your hips allow you flawless movement. But over time, the smooth ball-and-socket joint can get worn down, making your strides less graceful and decidedly more achy.

The gluteus maximus is the powerhouse of the butt—not to mention the largest muscle in your body. It gives you a kickstart when you run, propels you up the stairs, and provides protective padding—along with some needed fat—when you sit.

The area between your hips and your thighs is the groin. It’s claim to fame is the groin pull—a strain of the hip adductor muscles that run along the inside of your thighs.

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