Like everyone who studies performance, I’m indebted to the extraordinary Anders Ericsson, arguably the world’s leading researcher into high performance. For more than two decades, Ericsson has been making the case that it’s not inherited talent which determines how good we become at something, but rather how hard we’re willing to work — something he calls “deliberate practice.” Numerous researchers now agree that 10,000 hours of such practice as the minimum necessary to achieve expertise in any complex domain.