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Shade is your friend, go topless, and just ignore pace and just run real easy. Your heart rate will begin increasing rapidly at normal easy pace so you will have to try and slow down further.
The good news is that running in the heat gives you similar advantages to altitude training by increasing red blood cell count.
Thankfully the cloud cover came in just before I went out. Wasn't too far off my usual pace and I did take a more hilly route than normal, I've had my watch on the heart rate screen for a long time now to make sure I work to that rather than a pace. Knowing it helps in the long run is what's keeping me going when it gets like that.
I've entered the London Marathon ballot. I'm keen to see what I can do in a marathon without a swim and cycle before it!
I entered as well, kinda scary thinking how much I'm going to need to step up training if I get in. Good luck for October!