Just wanted to post a followup to Batty's excellent post. I was doing some Googling on bioelectrical impedance analysis and hydrostatic weighing and came across this page.

http://www.topendsports.com/videos/t...atic-weighing/

Watch the second video - Dr. Bull gives an excellent 5m 39s lecture on body composition and the determination of body density.

I found it fascinating, which is why I'm posting it here, thought it could be useful for any noobs (like me!) still stuck on scale weight!

Sarah