Notes
Longest run ever and in blistering sunshine. Tried to keep my heart rate below 150 and slowed down whenever it went over 160. Felt ok for long stretches but it was warm! Stopped at home after 14km for a drink and to wet my head. Felt very refreshed after that. The last 2km were especially hard and the bridge over the railway at Spånga really increased the heart rate. The tank did not have much left by the end.
I didn't use any gels but if it's that warm in the marathon then it's going to be a hard slog to run 18km more.