Maths
My maths must be weakening. When I set up a 30min exercise on my watch I created it in heartrate zones 3, 4 and 3, with 5min, 15min and 5min is each zone respectively, which obviously doesn’t add up to 30mins. It’s just as well, as after 25mins of easy jogging, my left knee began to ache. It seems to have been caused by runnin up a hill near Kenwood House. I’ll have to avoid hills for a couple of weeks I reckon.