In January, she told E! News that she was not watching her diet and was enjoying the heck out of all the candy Kris Jenner had around the house (this was when she was still living at home). "I eat so bad right now. I eat so many sweets and so much candy," she told them, before crediting her Dad, Caitlyn Jenner's good genes for her slim figure. "I have to start working out very soon."
A few months later, in June, then 17-year-old Ky did an interview with InStyle UK, where she revealed that she still hadn't caught the fitness bug yet. "I haven't worked out in two and a half years," she told them. "I'm living out my youth not doing any exercise and eating what I want, which is pretty bad."
Finally, over the weekend, Kourtney Kardashian convinced her little sis to hit the gym with her! "I've been trying to get her to workout with me for six months...today was my lucky day!" Kourt captioned the photo below.
Kylie also posted a pic of them during their sweat sesh, giving her sister a shoutout for how hard she's been working:
"First workout with @kourtneykardash this lady has been working hard!" Ky captioned the pic.
Of course, this isn't the first time members of the famous fam have hit the gym together. In fact, they do it all the time, which we think is all kinds of awesome.
The family that works out together, stays together, right?
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Gallery | Sweating With the Stars