I figured I'd post this in here because we're all going through about the same phase in terms of muscular development. I did the Wednesday night training race in my area last week and thursday I started randomly getting this piercing pain when I would walk. This continued through to friday when I started a short backpacking trip that went through sunday. I didn't feel it at all while on the trip and I was carrying a ~50 pound load. Then it started coming back monday and tuesday and is coming on much more frequently now. I tried going for a ride this morning, but I couldn't get past the end of my street as it would just hurt at the top of the stroke every time. I'm thinking it might be a strained quad, but I have no idea. My next real race isn't until August 10th, so I was wondering if anybody had experienced this before and what you did for it.