Training for a humid/hot race

Put a space heater in the room with your treadmill or trainer.

I think I saw a picture once of a guy who basically built a sauna in his basement to train in.

I've sometimes sat in the sauna at my gym for 40 minutes getting ready for hot races.  I bring in a bottle of water, sit for about 5 minutes, then do stretching and push ups for about 3 minutes to get some physical activity in there, going through that cycle about 5 times.  I've also cranked up the heat with a space heater, but that really only works if you have a small room, and you'd have to have the space heater going for quite a bit to get the temp up to 90F.  The whole thing with the sauna is that it gets the humidity as a factor.  Most people can't do 40 minutes straight.  At first I couldn't either, starting as low as 5 minutes and then eventually building up.  Also helps to bring in a water bottle since during the race you'll have one anyway, especially since you're going to lose a lot of weight in there for 40 minutes.

I love the heat though.  Wish I lived some place where it was hot all the time.  NJ doesn't do it.