Weighed myself this morning. Came in at 241 pounds. Then I went and did some chores at the church, then embarked on a 40 mile bike ride in the June sun. During and after the ride, I consumed ~ 1 gallon of liquids. Then I went to get a shower.
Before the shower, I weighed myself. Came in at 236 pounds.
Including the liquids I drank, that means that I lost 13 pounds of water during my bike ride.
Admittedly, some of that was lost through respiration, but still. That's a lot of sweat.
Inside: More about riding my bike but, fortunately, nothing else about sweating.