Welcome to the world of DOMS.
Did you ever notice that your legs feel more tired and sore the second day after a big ride, than on the first day after? It certainly happens to me.
I recently rode Tour de Cure, which was 10 miles or so longer than my usual weekly long ride; and my legs didn\’t feel too bad the next day. Not first thing in the morning, anyhow; and I decided to made a trip to get groceries. That was almost 10 miles, round trip; and once I got going my legs were saying that they didn\’t like it too much. They began to feel tired and sore.
Then, the day after that, it really started to catch up with me. On the way home from the grocery store I\’d had an unpleasant headwind; and the trailer to pull; and because it was drizzling I\’d been wearing a poncho. A flapping poncho creates a lot more wind resistance, and thus more work for the legs.
It\’s a good thing that Day Two post-TdC was Monday, my usual off-bikes day. I was still on vacation, so I could let my legs rest a bit and, I hoped, get rid of that pesky DOMS.