Ok, something is wrong. This is the second run of the exact route I ran earlier this evening. The first run I thought was an anomaly as my HR was just shooting through the roof. This second run has confirmed my suspicion that I'm into Over Training mode. It's probably a culmination of last nights hill workout, and I'm still sick (have had this headcold and cough for the past 3 weeks) and the wind has been very gusty at 40km/h. I'm going to have to take the next couple of days off again to reset