Christmas is well and truly over *sobs* and everyone's back to work and sweating the mince pies and booze off in the gym.And the Kardashian sisters are no different.

Both Khloe Kardashian and Kourtney Kardashian weren't shy about sharing their gruelling workouts with their combined 72 million+fans.

The reality star siblings both took a similar selfie to pop on their respective Instagram accounts...

Double gym selfie.

Kourtney's 'double gym selfie' comment was greeted with nearly 700k likes, and Khloe's slightly more serious pose had almost a million...

Gym selfie with the MILF

There's no doubt the pair look amazingly trim and toned, with abs they can be very proud of.

It looks like they're working out their home gym, but we're definitely not at all envious they have one all to themselves...

We wish we could be so easily persuaded to head back to the gym, but we love food far too much. Plus it's way too cold to be going outside.

By Mike Williams