I must be acclimatizing! It was *only* 35C and 80% humidity so figured it was perfect for running ... Still only doing short runs of 3.5k but managed it in under 16 minutes so not too bad (for an oldie). I don't think I'll do much more than 5k runs in the summer as I expect it will get a lot worse over the next 6 weeks but autumn (fall?) should be much better for running.