It is currently 86, feels like 90 and I have a 3 mile run to do. Doing it outside tonight is not an option, I have to head out of town for work. WWH&F do?
Inside. I'm a big baby. Three miles on the treadmill will be quick and easy. Three miles in 90* and direct sun will feel like shit. I could be swayed if it was dark outside.
Treadmill. My running buddy and I ran almost 4 miles in similiar conditions the other night and almost ended up with heatstroke. We are wusses. Oops, came in too late. Great job outside!