I don't know about pro baseball, because it's a much, much slower paced game...but I've been sweating head to toe, out of breath, and drinking a LOT of water during softball games. Yes most of the time I was playing from 9-12 on a weekend morning in Florida and it was over 80 and very sunny...but I have had a few of those days here in DC while playing at night. And I'm in decent shape! Even some of the 20 somethings here that try hard are the same.
The old guy can beat most of them in a race.
"They can build safer race cars, they can build safer walls, but they can't get their heads out of their a$$es far enough to keep them on the race track, and that's pretty disappointing. Y'all can figure out who 'they' is." ~Ryan Newman