I'm usually only just 3 or 4 lbs over my weight class. However, the day before a fight (weigh-ins are in morning) I purposely don't drink any water/eat any food all while having a good, sweaty workout in the evening. Usually drop 7-8 lbs. Goddamn does it boost me psychologically. I feel much more aggressive and much more focused on the match. It makes me hungrier (lololol) for victory. Got a match tomorrow and a Grape-flavored bottle of gatorade sitting in my fridge right now for after weigh-ins... Fuck it's killing me.