It probably has 2x10s if it has a floor above but it looks like its a garage which likely means its 1 floor. If this is true then I would assume it has trusses made out of 2x4s or 2x6s at best. This is why I was skeptical about the weight. If its 2x10s then go for it. As long as your connection points/chain are strong. You also have to remember that he's makin PRs pretty much every time he works out!lol He should be at 400lbs in no time.

Just lookin out for a fella!

IronWorker