We utilize dunk tanks. One end of the field there is a pond. So if it is warm they can go cool off after the run. By the house at the start we fill a 40 gal rubber made heavy duty water tub. They climb right in and lay down. Our session consists of about 200 yards of 1/4ing, 2 birds, 1-2 retrieves. So we don't over do it at all. Also just in case over heat treatment kit is right inside the door. Never had to use it. Common sense goes a long way in not over doing it.