I meant body including head. Desimplified, the equation is
HEAD + ADDEDWEIGHT = 1/2(TOTAL SYSTEM) = 1/2(TORSOARMSLEGS + HEAD + ADDEDWEIGHT)
You can find your (TORSOARMSLEGS + HEAD) weight by stepping on a scale.
Lying prone would present additional problems, as you'd need to guess the weight of your feet (farther from the pivot), legs, ass, etc. I tried to correct by having the body (not counting head) vertical and assuming its center of mass would be pretty equivalent to the head's center of mass. This is crap, of course.
I'm now working on a system that involves spinning the subject rapidly around different parts of his body and measuring the centrifugal force. But I'm not working very hard on it.
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