Brian Mackenzie

Unplugged, written with the physiologist Andy Galpin and the writer Phil White, argues that wearable devices and training apps have quietly replaced an athlete's own sense of what is happening inside their body. Mackenzie is a coach rather than a scientist and the book says so, with Galpin supplying the laboratory side of every claim. He has built endurance and breathing programmes used by firefighters, military units and competitive athletes, and the breathwork he teaches comes out of established respiratory physiology rather than being invented for the purpose. The certifications and courses are the business the book sits in front of.