When I was in my thirties I could pedal up monster hills that many people had trouble walking up. Now, I prefer walking up most of them, and pushing my bike. I did quite a bit of pushing yesterday. Shocking how much struggling I did, but it felt really good to be exhausted at the end of the day. I did not achieve my goal of cave exploration, but the magnificence of the canyons replaced the desire to find the big holes. Maybe when I get the dino-powered bike back?