Today I experimented with trying to stay in HR zone 2, and still keep up my desired century pace, by riding the big ring and fourth cog (50/24). It works quite well =)
Alas, I'm not doing very well with efforts that are meant to get me into HR zone 4. I still tend to shy away from working so hard that I'm gasping for breath. I'll have to go for it over the weekend. Tomorrow the schedule says, short and easy.
Oh, and of course my lunatic side came out this morning. Beautiful full moon! Actually it looked more impressive yesterday, when it was lower in the sky.