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         At birth we weigh some 
        3.3kg, and we are 500mm in length, of which our trunks represent some 
        70%. In the two decades that follow, our body length increases between 
        three- and fourfold, our weight increases around 20-fold and our linear 
        proportions change so that in the adult state the length of the trunk 
        accounts for only 52% of the stature. However, the adult condition is by 
        no means stationary ¡V our bodily proportions are modified by our 
        lifestyles and the inevitable process of ageing. 
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