During a tough workout with Khloé, Kim Kardashian proudly displays her toned back muscles

Kim Kardashian is showing off her fitness.

The SKIMS founder, Kim Kardashian, flaunted her back muscles in a film shared on her Instagram Story on Thursday. Kim can be seen performing deadlifts in an all-black gym outfit while sister Khloé cheers her on from behind the camera.

Kim scribbled across the screen, “Workouts with @khloehardashian really do it for me.”

Khloé, 39, gasps and whispers, “Oh my god,” before repeating herself while she watches and recordings.

“What are you training for?” she asks Kim. Kim swiftly responds, “Life,” to which the co-founder of Good American responds, “The Olympics.”

Khloé then pans the camera to show her elder sister from the opposite side, yelling, “Holy f-k, you’re gonna f-k me up later!”

Kim never lowers the weight while her trainer stands off to the side throughout the video.

This comes after Kim and Khloé released photographs of a “last-minute” 48-hour ski vacation to Utah with their children.

“We took [a] trip to Deer Valley for New Year’s Eve!!” the mother of two said on Twitter on Tuesday. “It was True’s first ever time on skis and we had the best time!”

True, Khloé’s 5-year-old daughter, is shown smiling alongside Kim’s four children in the images. In an Instagram post, the Good American entrepreneur also posted many photos of herself and True, as well as their 17-month-old son Tatum, suited for the chilly weather.

“We went with Kim and her four children, our friend Natalie and her two children, and me and my two children!” So it was quite a crowd,” Khloé said with photographs and videos of her kid learning to ski.

When it came to skiing, True “did so well,” she added, adding, “I’m so proud of her for being so brave and she ended up loving it!” “She enjoys skiing and playing in the snow with her cousins.”

Kim also shared photos from the vacation on Instagram, including photographs of her children in ski gear, toasted marshmallows, and Christmas coffee cups.