So, the jury is still out on my hip flexor. I rested Saturday, stuck to the bike and pool Sunday, Monday and Wednesday, but I took a shakedown run on Tuesday, and felt fine through 5 reasonably fast miles. Today I did 7 with C__ at a moderate pace, and felt fine again. The muscle is still tight. I feel it more when I walk, though, than when I run. Lots of stretching and fingers crossed . . .