Clue number 1: If you think to yourself on the way home from work that it is too hot to lay at the pool, you probably shouldn't then say, Self, let's go for a five mile run. Because about two miles from your house you will be dry heaving. The irony here is that this two mile mark is right in front of the pool where I should have been relaxing with a cold drink and Harry Potter Year 6 (oh yeah friends, I finished five and will comment on it later).
Live and learn. And go to the pool.