Doug Robertson, Body Mechanics, 4, The Arcade, St John's Wood, NW8; 020 7266 2368. Cost: £50 per hour. Doug assessed my posture, concluding it was not bad but, like most people, I would benefit from making my muscles work as they were designed to. The older we get, the more our muscles shift through doing the "wrong" things, twisting awkwardly, tottering on high heels etc. By making sure the skeleton, muscles and organs are all in their correct place, which Pilates aims to achieve, the body can work at its optimum level, using oxygen and energy supplies to best effect.