After all the rain we have had lately, yesterday and today have been beautiful again, with temperatures ranging from 50F to 75F, dry and sunny with light winds. I was able to really enjoy my long run yesterday: it started cool, but was quite warm enough by the end. However, at the end I felt quite tired and was feeling a little pain.

Pain at the end of a run is always a warning sign, and an indication to figure out what caused it. When I did an easy run today, the pain was still there, but ...