He doesn't seem bothered by the cold either. For a lot of that video I thought he was doing this in the fall when it might be warmer, or in a place where winters are warmer, but when the camera pans out near the end of the splitting part, you can see that the pond behind him is frozen over. But he's wearing what, a flannel shirt over a t-shirt?
Tough old guy. Any ideas where he lives (to get an idea of the climate he's doing that in).