Why does he have his weight belt around his nipples?
Set up for the deadlift. It's a powerlifting thing, some guys when they set up for a big pull find that the belt cuts into their hips too much, or they find the belt doesn't give them the support where they like it, so they hike it up a bit. It depends on how they're build. I see it in a lot of guys whose midsections are similar to bodybuilders where you go thin then really blocky.
I thought for sure those plates were gonna dump off, pretty strong spring claps.