I have participated in the Shamrock Run off and on, mostly on, since my high school days. Seen as the unofficial beginning of the spring race season, it’s often a litmus test of the winters training. It also usually is held on what seems to be the most miserable day of the year, generally windy, chilly and raining. This year was a nice surprise, with the lightest of sprinkles, minimal wind, and relatively high temperatures…