Runner’s blues

"Still, the most significant fallout from running the ultramarathon wasn't physical but mental. What I ended up with was a sense of lethargy, and before I knew it, I felt covered by a thin film, something I've sinced dubbed runner’s blues. (Though the actual feeling of it was closer to a milky white.) After this ultramarathon I lost the enthusiasm I'd always had for the act of running itself. Fatigue was a factor, but that wasn't the only reason. The desire to run wasn't as clear as before. I don't know why, but it was undeniable: something had happened to me. Afterward, the amount of running I did, not to mention the distance I ran, noticeably declined." (#23 p.116-117)