If you're looking for an ab routine for the holiday season, this might be the one.
The Women's squad of England's Retford Gymnastic Club followed the footsteps of a Boston gym that posted this insane ab routine called the "Baby Shark Abs Challenge". They do the workout to the catchy kids song "Baby Shark," which is how they got the name.
Watch the video to see the full routine. My abs are sore just watching this.