I wrestled in HS and I had decent cardio and was always good at cutting weight. I had a teammate that didn't have to work as hard as me to do it though because he was good at "drifting" weight. I had more stamina then him when it came to matches though. I notice with the Dolce weight cut that guys just sit in a hot tub for 30 minutes to an hour and lose all sorts of pounds doing it. They basically are well nutritioned and then just flush the water out of there system without doing any cardio work. I noticed that some of the guys that do that gas in there fights.