Breath’s final section — a crib sheet of techniques — would certainly be useful before a big meeting, as part of a mindfulness practice, or to ease insomnia. However, just because the solutions are simple doesn’t make habits easy to break. ‘It’s only through disruption that we can be normal again,’ says one of Nestor’s sources. ‘Disruption’, the religion of Silicon Valley, describes how something inefficient or costly can be done with much less effort for optimised results. But ‘disrupting’ the autonomic reflex of breathing comes at a potentially high price: neurosis. ‘Enhanced respiration’ is likely to be a growing market in the near future. Let’s remain sceptical that becoming even more aware of our breathing is something we’re willing to buy into.