Once set, I stick to my training plan. If it says “60 minute bike, zone 2 heart rate” I bike for 60 minutes in my zone 2 heart rate. Not 59 minutes. Not zone 5. 60 minutes. Zone 2. It’s not that I never deviate – it just causes me considerable angst when I have to switch things up for some reason, such as illness, let’s say. On Wednesday morning, when I awoke for the third day in a row with an animal of a cold living inside of my chest, my training plan mocked me. “Brick: 60 minute bike …