This weekend, a friend supplied me with a concoction that he drank during his racing years. I'm not sure what was in it, but I know from experience that after two hours of hard riding in the Florida heat, I'm usually burned out and ready to go home. This time, I managed to ride hard for five hours in 90F before reaching that point. I'm going to find out where he gets this stuff and take it with me on future rides. I just hope it doesn't contain any illegal substances.