Makeup-Free Kourtney Kardashian Is Ready To Kick Her Butt Back In Shape

It seems like one of Kourtney Kardashian's New Year's resolutions was to get back in shape, as she tweeted a selfie from the gym yesterday and wrote "Day one..." Not like she's ever been in danger of getting flabby, but you can never be too prepared for bikini season!

The reality star also tweeted a hot throwback photo of herself in a bikini and added, "This is why I started working out today..." Kourt also added a Keek video as she climbs a Stairmaster. We're so glad we know exactly what she's doing all the time ... gotta love social media!

And we're sure she'll be able to get her body back in no time...