Having only done commutes for...oh, two years, I've been riding more, and leading a weekly after-work ride gives me no place to hide.. This Wednesday was the first day I felt as if I'd got my mojo back. I think I only used full effort once in 30 miles (to drag the fixie up a nasty hill) and, although I'm getting twinges of cramp in my calves, the old CV system seems to have plenty to spare. Hilly 30 miles tomorrow morning - let's see if there really is a breakthrough or if I was just having a good day. I thought I might need to use the turbo trainer - that ALWAYS gets me fit (after a few months on that, I could knock out about 350W for 20 mins when I was 25) but it's horrible.