At a gym I train at in Hawaii, the owner was showing me a few photos of a competitor that trains there that won a show the previous Saturday, he looked amazing, he won the heavies at the show, the guy just happens to walk in and the owner introduces us, the guy looked like a completely different human being, it was Wednesday, he easily had to have put on a good 35 pounds in a 4 day span. It was crazy, I guess he cuts super hard for shows and used to fight mma that he would cut crazy weight for as well, I never seen something like that. I put on probably 5- 10 pounds or so maybe a week or so post competiton, but swings in weight like that can't be healthy.