Sam, you did a ride, that is more than a tremendous percentage of men our age can say that they accomplished for their day. We all have some days where the legs feel a bit off, or even leaden, for me the ride helps get that feeling out of my system. With Parkinson's I have times when the legs go from twitching/tremors to feeling like they are a solid mass of clay. When I can get out and ride for a few miles that goes away and I feel much better. Getting some circulation going and a bit if fresh air is my pick me up, now. Good job on getting started cycling so well.
Bill