This all sounds fairly simple, but why bother in the first place? First of all, a logbook acts as a source of motivation in itself. When you start adding up all the kilometers you’ve run, you get a feeling of achievement which will help build your confidence as a runner.
Interesting article. I’ve never thought about keeping a proper logbook for my runs, but I do track my runs with Runkeeper on my iPhone, so I guess that counts sort of like one.