Look, no pulled muscles...

Personal achievement for the week:

Last night I went to a rapper practice, and managed three tumbles (out of three).

A "tumble" consitutes standing between two people, your hands on their shoulders. You then flip over backwards, using them as supports. I was trying to learn to do this a while back, but stopped when I hurt my neck (Note for new readers: neck was hurt in a car crash, nothing to do with the tumbling). I've never really managed it properly before, having been prone to things like getting stuck halfway over (ie upside down), and, er, falling off. I'm still not up to speed, but the theory appears to be there now.

Oh, and...

( Woohoo )

What am I made of ?

Now, according to my highly approximate calculatons, a pint of blood is about half a kilo. That means I have around 4 kilos of blood in me, ie less than a tenth of my body weight. (I think, I don't really do kilos).

So, roughly speaking, what percentage of my weight is where ? How much do my bones weigh ? Internal organs ? Muscles ? Anyone have any idea of how I could work this out ?

(I should add that this is merely curiosity, triggered by having just been to blood donors'. I'm not considering a radical weight-loss strategy or anything :)