I am terribly out of shape and ride recumbent. I though there probably wasn't much here for me. Then I read the section where Harr says if you aren't going to clip in you can't cruise along at 20 miles an hour. He also said some of you should never clip it, but I can help you. Well that's me, I should never clip in. And I am riding a different type of bike. But I kept reading.
I decided I wasn't physically ready to do his multi-week plan. So I focused on his chapter of tips and tricks to up your speed. The first day I went out to try his tips I upped my speed significantly. I saw a 4 mile an hour increase in my riding speed and a six mile an hour increase in my sprint.
I keep turning back to this book and rereading the tips, trying to get them to be habits when I ride. I found a lot of good information here.