I saw this on Dan John's subforum on DaveDraper and then on his blog:
It's a 4 week swing program (3x/week) by the folks at Kettlebell Fever. It focuses on goat bag swings, goblet squats, and the HKC swing.
It's a high volume approach and among other things will really work on your ankle mobility and hinge pattern.
Of course, I decided to try it without thinking things through. Wow. After Day 1 my legs felt like jello but my hips, back, and shoulders felt great. My ankles were not happy. Your mileage will definitely vary because you are going to be patterning the hell out of the swing and squat movements every workout.
The last time my ankles felt like that I was in Japan at a class doing high volume deck squats (aka koho ukemi - back breakfalls).