Big Half

Walked over Tower Bridge to the start of the Big Half. 

it was 22C when my wave started at 9am and was climbing towards 25C by the time I finished. Started behind a 1:50 pacer and was comfortable for the first quarter of the event around Canary Wharf, but by half distance (heading back towards Tower Bridge), I was starting to struggle despite drinking water at every opportunity (plus gels at 1/3 and 2/3 distance). I walked a bit to cool down (initially just 30s to reset, but later for a minute or two), then just concentrated on getting round. Finished in 2:04:43.

Looking at the official results and the split times, I clearly went off too quickly (10k in 54:29) and paid for it big time in the third 5k. This was run/walked at a grovelling 06:32/km pace. I then picked up the pace a little after that, but - conscious of the heat - I didn't want to be falling down at the roadside.