Stuart Sandeman, a former banker from Edinburgh, has become the poster boy of the deep exhale. His clients include Google, Nike and burnt-out executives. Robert Crampton has a session with the respiration guru – and discovers he's been doing it wrong all along.

Stuart Sandeman's technique is called "breath work" for a reason. After an hour forcing myself under Sandeman's instruction to inhale with my abdomen not my chest, I feel like I've put a proper shift in. What ought to be child's play (literally so, because as babies, we all naturally breathe using our diaphragm) has turned into something

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How to breathe for energy, focus and sleep