I recently ran my first half-marathon. I'm sort of a fitness buff, so the cardiovascular element of running is relatively easy for me. But oh, the aches and pains of using muscles differently than I do in my normal gym-rat/yoga-girl routine!
My lifelong pattern is that I can run six or seven miles just fine, but right around mile 7.125, I get a shooting, sciatic pain deep in my hip. Then, as if on cue, my genetically archless (sigh) feet share with me precisely how they feel about the impact I've subjected them to during the preceding hour.