This pain could be from my iliotibial band, as the twinges of discomfort cause numbness throughout the leg and terminate in a strained sensation in my calf. However, there is no pain in my knee, as is typical to ITBS. The pain and numbness last a half-hour at most.
Last year, I thought the deep butt pain was a result of all my track work and the continuous left turns. The pain quickly went away, and I went on to run my current fastest marathon.
This year, I haven't even driven by a track, let alone stepped on one. My next guess would be to blame my faster running for the pain. (Tempo runs have ranged from 7:59 to 8:23 per mile in the last month.) But that wouldn't explain why I felt the sensation after yesterday's recovery run at a 10:06 mile pace.
If speed isn't the issue here, dude, then what is? I could blame the ramp-up in mileage. I could blame sloppy running form. I could blame my weight. I could blame the roads. I could blame the trails. I could blame the shoes. I could blame the occasional lack of shoes. I could blame society. I could blame the images on TV. I could blame Canada. Or I could just blame you.