Here’s how to ensure the largest muscle in your body isn’t also the laziest.

Read up on all the different butt muscles and how to effectively train them.

“That ability to be bipedal is a huge deal,” she says.

woman-pushing-weight-sled-with-butt-muscles-glutes

Photo: AleksandarGeorgiev/Gety Images

“And it’s this muscle that is really doing a major component of that.”

Ready for a little butt muscle anatomy lesson?

Stand up and balance on one legyep, your glute med and min just kicked in.

“With a wide pelvis, you may have a more horizontal orientation of the butt muscles.”

If your back is more curved, your buns may appear more lifted.

So just how much of your butt shape is predetermined by genetic roulette?

But no matter what shape of butt you start with, it will morph later in life.

“That’s why pants don’t fit the same way as you get older.”

(BTW, Kim Ks trainer is spilling herbest barbell squat secretshere.)

Some studies suggest that the gluteus medius and minimus consist primarily ofslow-twitch muscles.

“Much of the female posterior is adipose [fat] tissue,” says Reed.

(Again, if that’s your goal.)

If you want to build muscle,adjust your calorie intake and strength-training workoutsaccordingly.

“Instead, within your own structure, maximize what you have.”

(But let it be known: Itis possible to work your butttoomuch.)