The experience of flow is still one of the least understood phenomena in sport. And yet it is one of the richest, most memorable experiences an athlete will ever know.

Some call it a natural --high.-- Others refer to it as being --in a zone.-- Whatever it's called, flow is an elusive and very sought-after psychological state that athletes, coaches, and sport psychologists have tried to understand, harness, and employ to their benefit since Mihaly Csikszentmihalyi first coined the term back in the early 1970s.

Now, in the first book devoted exclusively to flow in...