Once you settle down on either your haunches or a funny little stool prior to the class kicking off, you're enveloped by a sense of calm and well-being. Not even street noises seem to bother you any more. When the class starts, however, you realise you're part of something much bigger: you are a central component of a highly centred and concentrated group of stretching and contorting adults who are, for a full hour, simultaneously trying not to break wind.
