A big Bowl of All-Bran or a giant galss of cherry juice the night before will make sure you are 'empty' in the morning which is not too bad for a Same Day weigh in. I suspect the pro's are doing what Amber suggested in post #5. Picosalax is available over the counter at the drug store, this will flush most of the water out of your body and you will see dramatic temporary weight loss (about 10lbs). The risk is that you will be dehydrated, so it is not good for Same Day weigh ins but it is great for 24 hr before weigh ins. If you use it you need to re-hydrate with elctrolytes (pedialyte or chicken noodle soup) to avoid cramping up or worse.