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Kim Kardashian’s Skims has a new “Fits Everybody” collection, and it features some familiar faces, including former Victoria’s Secret models Tyra Banks, Candice Swanepoel, Alessandra Ambrosio, and Heidi Klum.

Heidi just dropped some BTS content on Instagram and wowzer.

In one video, the 48-year-old supermodel works it for the camera in comfy-looking gray panties with a matching bra top. Heidi accessorized the whole thing with sculpted legs, a firm booty, and abs you could grate cheese on. Evidence:

A post shared by Heidi Klum (@heidiklum)

Heidi doesn’t allow comments on her Instagram posts, but I’m pretty sure it would be flooded with enough fire emojis to burn down Instagram if she did.

Apparently, Heidi was really feeling herself in this look (FAIR), because she dropped a slew of pics from the shoot that show off just how ridiculously fit she is these days.

A post shared by Heidi Klum (@heidiklum)

A post shared by Heidi Klum (@heidiklum)

A post shared by Heidi Klum (@heidiklum)

How did she get that super fit…everything? Heidi is big on running.

“My favorite workout is a long run along the Westside Highway, which stretches along the Hudson River in New York City," she previously told Glamour. "It's a beautiful path, and you always feel surrounded by such an amazing community. You see the same people running every morning, and they inspire me to keep going."

Heidi told People that she likes to wear ankle weights on the treadmill and do butt lifts to focus on her inner thighs, too. “It’s always good to keep the muscles underneath working so that it is nice and toned,” she said. “Toned is good.”

Heidi is also into being active with her kids, doing things like biking on the beach and jumping on the trampoline with them.

It doesn’t hurt that she’s a healthy eater, too. Heidi shared with Women's Health UK that she likes to have a breakfast of an egg-white omelet with green pepper, spring onion, spinach, and parsley, with a side of fresh fruit and a cup of tea. For lunch, she’ll reach for a protein like chicken, turkey, or tuna, with grains and vegetables.

Dinner might be soup that she has her kids help her make. “They see what goes into it,” she said. “Someone doesn’t just drop it off in a [delivery] bag.”

Heidi makes it clear that she works hard for that next-level body.

“Your metabolism definitely changes when you turn 40," she said. "I always thought, ‘That's not going to happen to me.' But it is happening to me. If I indulge more, I have to exercise more. I've figured out what works for me."

BRB: Gotta go buy some new underwear.