Kourtney Kardashian's "Lucky Day," Finally Gets Little Sis Kylie Jenner to Work Out with Her

It's never too early to start your New Year off right, and it looks like Kourtney Kardashian and Kylie Jenner are getting a head start.

Kardashian, who has been showing off her dutiful daily trips to the gym and the impressive payoff since giving birth to son Reign last December, finally convinced her little sis to join her. It seems that Jenner has been less than eager to accompany her sister for a workout. But Kardashian finally won her over and shared a cute picture of the two, mid-session. Kardashian wore black leggings and a cut-out crop top while Jenner opted for a matching gray sports bra and capri leggings.

"I've been trying to get her to workout with me for six months...today was my lucky day (sic)," big sis posted on Instagram over the weekend.

Jennier was also getting in the spirit with a mirror selfie she posted of herself with Kardashian. "First workout with @kourtneykardash this lady has been working hard!" Perhaps Jenner will work out more with her sister now that she knows it is a great opportunity for cute selfies!

Though her sister Khloe Kardashian has been getting major attention for her body "breakover" this year, Kourtney has also gotten in great shape and has been sharing her progress and health tips on Instagram. She posted an Instagram photo a few months back post-workout with the caption, "Working out is one of the only things that helps when I'm feeling anxious."