We do a lot of it. We generally do it very badly, as is evidenced by the growing lists of damaged parts we develop through sitting for long periods. Nor is it entirely due to our increased longevity that these lists are lengthening. Complainants of neck pain and sore knees include an increasing-number of children – some as young as three years. We have advanced in strides to protect our health from invasive attack; but when it comes to recognising the importance of good carriage and well co-ordinated movement for the healthy maintenance of the systems and structures of our bodies, we have less awareness today of the effects of use on function than in pre-industria ages, when we were the machines we used. Even my 19th century Encyclopedia of Embroidery opens with a paragraph entitled “How To Sit To Sew”. It warns of the importance of ‘bringing the work up to the face, and not the face down to the work’, and it goes on to enumerate some of the terrible things that can happen to the neck, back and eyes of a seamstress if good sitting habits are not adopted from the start. Before the 20th Century, in both our leisure and work activities we paid attention to using appropriate postures and appliances to do a job or pursue a hobby. Nowadays we see children playing sports which, with their poor co-ordination, can only harm them. We wait until our own bodies are so badly damaged that replacement of their parts becomes necessary.