Originally Posted by Dan333SP

QFT. I did a 5.5 hour ride this summer which was probably my longest ever, but felt pretty much fine walking around after the ride despite stopping once for a bathroom break and snacks.

I also did a high intensity circuit training class with some friends over the summer (doing lots of weights, stair climbing, pushups, etc) and could barely raise my arms over my head for a few days after, because I hadn't done any resistance training of that intensity for literally years. It's all about how often you push certain muscle groups to their limits.