I have just read a reminder of why the dead of summer is my least favorite time of year to ride.
Lurking over on the Adventure Riders Forum, I ran across this story.
Dirt Biker Dies of Heat Exhaustion
For me, this raises two questions:
1. What do you do to stay hydrated when riding during the summer?
2. How do you judge your own "state of fitness" while in the midst of riding?
Huh. He was just a kid starting out.