Kourtney Kardashian is using an old bikini picture of herself as inspiration for a new healthy lifestyle in 2014.

The 34-year-old E! star hit the gym on Tuesday, Jan. 14, and added a healthie to her Instagram account to tell her fans about her new fitness regimen.

"Day One," the mother of two captioned the snapshot.

The makeup-free beauty looks ready to exercise and break a sweat as she poses by the weights in a white top, leggings and neon yellow sneakers.

The Keeping Up With the Kardashians star also shared a glimpse of her workout in a Keek video as she climbs the always challenging Stairmaster.

Jan 14, 2014 | Back at it! by kourtneykardash on Keek.com

"Back at it!" Scott Disick's ladylove added along with the faceless short clip, which shows her feet effortlessly walking on the machine.

Kourt later explained the motivation behind her decision to get back to the gym and document the experience on social media.

"This is why I started working out today...," she wrote along with a vintage photograph in which she is sporting a skimpy white mesh two-piece.

It's unclear when the professional pic was taken, but Kourt is grinning widely as she shows off her enviable bikini body in the revealing swimwear.

Be sure to tune in to an all-new season of Keeping Up With The Kardashians Jan. 19 at 9 p.m. on E!

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