SEVERAL TIMES a day teams of young-professional varieties collect at 7Breaths, a meditation studio in central London, merely to breathe. The studio affords yoga and meditation classes however their signature class is targeted on “breathwork”. These attending sit cross-legged atop small cushions within the heat, minimalist area, as an teacher gently guides them first to concentrate to their breath after which to steadily lengthen the inhales, the exhales and the pauses in between. The aim: to de-stress.