Intervals are the main training from now until I start to taper at the end of the month. They're simple: ride as hard as possible starting at the bottom of the hill, until there is no hill left. Done right, one has the vague sense of being turned inside-out. Hard work, but over quickly. As the time scale shows, I was done in 35 minutes. Figure 15 minutes to warm up and get out to the hill and another 15 cooling down and getting home, and it's all done in a little over an hour. Tomorrow will be a recovery day, so it works out to less than 4 hours per week. Four hours of hard work are more useful than a month of Sundays riding longer distances at less intensity.