The thing is, however, I've always had a fair amount of leg muscle. So I'd find myself in the situation where if I wanted to run somewhere or sprint on the bike, I'd be able to get going fairly fast, but then I'd be panting in no time.
Except now I can actually run some distance without getting tired. So I was taking pictures with the wife and didn't want to waste time, so I ran over to the spot I thought would be more photogenic. And something in the back of my brain said "Whoa, better slow down or you'll be out of breath." Except that's the way I was, not the way I am now.
There's a vague thought in the back of my head that I really need to see exactly how far I can actually run these days.