Fun & Fitness over 50

Endorphins.
I don't suppose it matters what you do as long as it generates endorphins.
Then you're feeling good, i.e. having fun.
Of course I'm talking about physical activity not taking drugs or some other illicit and/or harmful behavior.
Today at the end of my bike ride, I was going down my last hill and realizing this had at least one element that skiing has. Speed and coasting downhill.
It didn't have the g-force and graceful dance of carving turns but that one element of going downhill fast. On the other hand you do also get that g-force thing on fast, tight turns when riding a bike. You know, like a dive bomber peeling out of formation to attack a target. Nyyaowww! Come on admit it, you've done it.
In fact I found myself doing linked turns on the bike in and out of a paved culvert on the side of the road going uphill no less.
Anyhow, I've been doing these short, 1 hour rides trying to get myself back in shape for the cycling season and nursing an injured right knee. Today was a really good ride, about 13 miles. It took almost 3/4 of the route to eliminate the right knee pain but it did go away. The last vestige of it was a little tweakiness on the front of the patella when standing on the pedals.
I'm still not pounding it and no big hills yet although I was tempted to go up Orchard hill.
This could be a good season!