The spelling thing matters way more than people realize, so don't just assume you're fine because his name looks different. Trademark law looks at whether the names sound alike or could confuse customers, not just how they're spelled, so "Brown Fitness" vs "Browne Fitness" could still be a problem depending on what he actually sells. What I'd dig into first is whether his trademark is even for the same type of goods or services, because a trademark only covers the category he registered it under. If he trademarked something for, say, clothing and you're running a gym or personal training, that's a much weaker claim on his end. Also check if he's actually using it in commerce or just sitting on the registration, since you can't keep a mark alive if you're not using it.

My old boss did the same thing with battery terminals. He made me pull every cable, scrub the posts with a wire brush, and coat them in dielectric grease before I could put the car back together. I thought he was just making me kill time on slow days until my own truck started eating batteries every 8 months from corrosion creeping under the clamp. Now I do it on every single car and it adds maybe 10 minutes but saves people a tow. That 20 minutes your guy spends is nothing compared to drilling out a snapped bolt on a rusty frame.