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dmaziuk, I don't really think lungs have anything to do with a weight check in full gear, other than holding a normal breath then exhaling to find out where you're at. You're dealing with offsetting all of your buoyancy--body, wetsuit, et al (positive or negative) by finding the correct amount of weight. Buoyancy just wearing a bathing suit has only to do with the body. Apples to oranges.