This did make me feel better, though. A challenge friend had this to say via e-mail:
I also wanted to let you know that your 20 minute run the other day really inspired me. It's impressive when [someone] runs a half marathon, but it's hard to translate that back to what I can do. You are at about the same level as I am, so your success really helped me realize that maybe I really can do it to. Thank you!
My exercise habits have never been considered encouraging before, so that is really, really cool. Thanks, friend!
Walked at 4.0, ran at 4.9