The water cycle is the process whereby water makes continuous flow below and above the surface of the earth.
Evaporation of sweat describes one way that humans contribute to the water cycle.
When human breathe, air is filled in lungs. Some of that water in the lungs condenses into water vapour. When he exhales he releases more water than what he had breathed in and adds water which is present in the water cycle.
Human sweat cools down. Droplets of sweat evaporate from the human skin where the sweat turned into water vapour and it enters in the water cycle.
