Kourtney Kardashian Shows Off Her Amazing Body on Workout Date With Kylie Jenner

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Nothing like a little family workout time!

Kourtney Kardashian posted a new picture of her totally fit figure to Instagram on Saturday, posing in the gym with sister Kylie Jenner, writing, "I've been trying to get her to workout with me for six months...today was my lucky day."

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Good to see the sisters staying active!

In addition to this latest snap, Kourtney also posted several throwback photos from the family's summer vacation in St. Barts, where the 36-year-old reality star stuns in a revealing gold one-piece while riding a fitness bike.

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We're in St. Barts on tonight's episode, wish I was there now. #KUWTK

A post shared by Kourtney Kardashian (@kourtneykardash) on

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Looking good, Kourtney!

The mama of three has been showing off her body a lot lately -- including a fully naked photo last week that exposed her backside -- at the same time as she finds herself at the center of the rumor mill. Last week, after reportedly trying to "work things out" with her estranged partner, Scott Disick, the reality star was rumored to be seeing 21-year-old pop star Justin Bieber. However, a source told ET the two are "just good friends," adding that Kourtney "wouldn't go there."

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Meanwhile, Kourtney posted a sweet message and throwback photo with her brother, Rob.

Watch the video below.