I'm melting...

The heat is making me nervous. I try to get out to run between 7 and 7:30 am, and it's already really hot. It's only June and we've already had many 100+ degree days! I'm nervous about August. I'm not into running in 90 or 100 degree weather. And the treadmill at the gym just isn't the same. When I go back to work, I'll have to do most of my running in the evening, or get up at, like, 4 am to run in the morning. I'm just not all that into the 4 am thing. But even at 8:30 and 9:00 at night, it's still in the 90's!! However, I'll do it if I have to. Going back to work was one of the things that derailed me last year. I'll have to make sure I fit my training in no matter what. Anyone have any tips for beating the heat when training for a marathon? You'd think I'd be used to it by now, having lived most of my life here in Texas...