That's great, Bill! I thought I've felt the same way recently, but after careful evaluation it's slightly different. For a while there I thought the fitness level was going up and yadda, yadda.
It turns out that it's just so much more pleasant cycling in the recent sunny, 70 degree weather than it was during the Winter here in Northern Ohio. I started cycling almost daily last November.... I never believed you folks that someday cycling would be a pleasant experience. I was almost convinced that cycling was supposed to be like riding out a storm while tied to the masthead!
Glad you're feeling your oats, fella'!