Holy enchilada, Active Release Techniques--aka ART (R)--is frickin A-mazing.
Turns out my malady is a tight left hip flexor that is creating a domino effect of tension and pain on the rest of my left leg, hip and back. After a little ART on the flexor and hip, I can move without pain....and touch my toes again! Yay!
My homework is to do yoga (ok, yes, I admit that skipping yoga the past two months was a very, very bad idea), stretch my hip flexor, more ART on Friday...and yes, in all likelihood I can run the Rocky Mountain Half Marathon on Sunday.