I'm 6'4", or used to be, was 180 pounds in HS, now around a persistent 240. We have a small gym in the building that I use, not many others do. I also stretch a fair bit.
Every year at baseball I see 30 somethings blowing out hammies or calves or quads, mostly legs. I'm out there running on the last day, slow, but running, I get sore after, but not too bad. We play two 7 inning games a day and it adds up. Baseball is not an old man's sport at all.
I'm going to look into attending a Reds camp I think, they used to have one. It might overlap timewise though. The Braves do a super job, about 2.3rds of the attendees come back each year.