Seems like a great exercise. Although, unfortunately I don't have the mobility yet to get down into that position (i.e. weight remains on heels, back does not round, etc.). Something I'm really trying to work on. I can only squat just slightly past parallel and then my back starts to round. How's you guys' squat form? If you are able to go all the way down like the guy in the video did you do anything specifically to gain that mobility or are you just naturally limber?
Also, do you guys have access to kettlebells either at home or at your gym? I've been doing 1-arn swings with a dumbell for a sort of cardio workout on my off days but I'm thinking about getting a 24kg kettlebell. Just wondering if you had found some cheap ones somewhere and if you like using them.