Don't do what I did today. First I mowed two lawns equal to approximately 1 acre with a push mower (my yard plus one of my rental properties). Then I went out on a training ride with a much younger rider/racer for a 50 mile loop while the temps were still at 94 F and the humidity was sky high. There was a mechanical problem with my main ride (long story), so I was riding my beater bike - a 20 year old Cannondale. I have to say that my Lemond Zurich is a MUCH nicer ride than my old Cannondale except for the Brooks saddle on it that I have been breaking in since 1980. While I thought that I had rehydrated after the nearly three hours of lawn mowing I must have been down a couple of quarts. On our ride I did the lion's share of the pulling at 20 to 21 mph into a 9 mph head wind to get to the hills (for Florida - imagine Interstate overpasses except twice as high), but then I started hurting. After the hills the wind switched around 180 degrees. Bummer! After 35 miles I was seriously hurting from lack of water. I refilled and rode about 10 miles and had to refill both of my bottles again as I was sucking it down as fast as I could. Obviously I made it home, but that was one tough ride mostly because I was not properly hydrating. Perhaps I should have two beers and 4 shots of Jack tonight a la Floyd and have the ride of my life tomorrow!