I don't know anything about this horse, he's just the first result for "wgc twh" on youtube. I'm not saying he was sored. In fact, I'm assuming he's totally clean and all that action is only from the shoes. Just watching him move gives me the heebie jeebies.
All that action comes from the enormous, heavy shoes on his feet. Padded horses can't be turned out in anything bigger than a stall-sized paddock, and they can't be ridden on trails that are the slightest bit muddy or trappy. They live in their stalls, only getting out to be ridden. It's a tragic, shitty life and they break down fast.
Here's a happier video. This is what it's supposed to look like! (thanks for putting this together, LCT!)