I go by at least 50 different names
Some are proper—like buttocks and glutes; others kid-friendly, like bum, bottom and fanny; some are fancy like derriere, cute like tushy, and a whole lot we can’t say here. Whatever your name of choice, your booty is made up of three muscles: the gluteus medius, which sits on the side of your hip; gluteus minimus (the smallest); and the gluteus maximus—the alpha of the group, for good reason. The Gmax (we didn’t make that up) is actually the largest muscle in the human body and the one responsible for the shape of your rear.
I do more than make your jeans look good
When you move your leg backward behind your body—that’s your butt muscles at work. The same is true when you lift your thighs off to the side or turn your toes outward from your hips. These actions allow you to get up, walk, climb stairs, move sideways, crouch down, or stand tall. Weak glutes, from bad posture or not enough use, means other parts of the body have to compensate, says the American Council on Exercise (ACE); over time, this could cause a muscle imbalance and put extra stress on your torso and spine, which may lead to injury. Research shows some of the best moves to strengthen your glutes (and do your jeans justice) include squats, lunges, step-ups, quadruped hip extensions, and four-way hip extensions. These are the 10 secrets your personal trainer doesn’t want you to know.