day 4.

60 mins hard cycling on road. very undulating and hilly, so i was happy to get an average of 15mph when i checked my cycle computer.

the last ten mins of the ride were HELL. i must have totally burnt up all carbs and my body must be slow to adjust to burn the fat. felt really cold, and tired even though i was sweating buckets. i've had this before when i didn't have enough to eat before i went out so i know what caused it - zero carbs.