Well wonder no more. A new clip shows the former husband and wife in their own exercise video from the nineties – and it is amazing.
It's called Power Walk Plus: Getting Started with Kris and Bruce Jenner, and it's reportedly at least 20 years old.
Momager Kris, now 59, is walking on the treadmill as an almost unrecognisable Bruce puts her through her paces.
He says: "You control the pace. You'll be fine as long as you stay nice and erect."
Proving that the family has always been a little bit vain, the wall behind Kris and Bruce is adorned with family portraits.
Kris' daughter Khloe, 30, obviously thought the world needed to see the video, as she posted it on Twitter.
Bruce, 65, and Kris, who were married for 23 years, finalised their divorce last year but he is very much still a part of the family.
Speaking previously, Kris said: "Things are really good. I mean, it's kind of surprising, and we work together, and we talk all the time."
While Bruce is yet to start publicly dating following their split, Kris has moved on with 34-year-old toy boy Corey Gamble.
Watch the hilarious clip and let us know your thoughts below.