Two rides Friday: 35 miles in the afternoon, maximum effort to beat my previous best times on some tough segments (and did); then another 38 miles at a casual pace with friends. Could barely move my legs the last couple of miles home in granny gear. Closest I've come to walking the bike home or just collapsing in the street. On the plus side, it confirmed my determination earlier Friday to make that first ride a genuinely maximum effort, leaving nothing in the tank. And that's what I had in the tank going home later. Nothing.