I seem to be having a flare up of

Iliotibial band syndrome. [Yes, I cut and pasted that.]

The exercise on that page has me feeling better already. Don't anybody say anything about the placebo effect.

Marathon Sunday. My plan is mostly to do that exercise and some other stretches, and rest until then; let that muscle strengthen and heal. Hopefully I can get in a seven and a two mile run in, but I'll just have to skip 'em if the leg hurts. Maybe I can do some pool running at the city swimming pool. The girls'd like that.