Originally Posted by cjohnson728
Yes, and apparently I didn't do it fast enough; I stopped, then started blowing again. Once I got the hang of it, it was okay, but I kept thinking I would pass out getting rid of all the air...
I still don't exactly understand the science behind it, but I trust it.
I think it's a buoyancy thing- fat floats, the less air in the lungs the more accurate the results will be.....I think