Well, the reality star, 31, is on the cover of this month's Women's Health and opens up about why she started working out so hard three years ago.
"It started around 2012," she told the magazine. "I was having a hard time with [ex-husband] Lamar [Odom]. It was toward the end of our union, and there was so much drama. I needed a release. At first it was so hard. It was baby steps, but I started feeling so much better."
It's been over a year and a half since the two filed for divorce. The couple had been married for four years when Kardashian filed in December 2013.
Having her life play out in the public eye, even the rough patches like a split, is tough.
"There are times that you feel that there are too many people that know everything about me and you want to pull back. But then you have to remember why you were even put into this, the limelight. If it wasn't for my family and us doing it all together, I don't think this would be a bearable thing," she said.
Kardashian added that initially getting in the gym wasn't easy.
"You're exhausted, you're sore, and I actually felt fatter because I was swollen," she said. "If you keep going, you're eventually like, 'Wow, is that an indentation on my arm?'"