Grade: 3
3/9 can't walk
3/10 can walk, but with short strides
3/11 feels fine
3/12 tight and sore
3/13 fine before and during jog, but sore after
My experience with muscle pulls suggests that the problem is less mechanical than something to do with general health. In this case, I think that my muscles had not recovered from "dehyration/electrolyte imbalance" from saturday.
Some icing , lots of stretching, and a diet including some organ meats.