This book provides an integrative empirical analysis of numerous anecdotal notions and clich?s that have permeated sport psychology, including just do it, the ideal performance state, mental toughness, focus, and the idea that sport is mostly a mental game. The author, Dr. Roland A. Carlstedt, travels where no researcher has ventured in quantifying these slogan statements, bringing new insights and data as to their meaning. His Theory of Critical Moments provides a long-overdue, lucid and highly plausible explanation for the dynamics of Zone and Flow states as well as the effects of intrusive cognitions on sport performance. In attempting to quantify the Zone, Carlstedt presents provocative data and perspectives on brain and heart interactions, suggesting that specific parameters of these measures reflect peak performance states. His model has explained up to 44% of the variance in the performance equation that can be attributed to psychological factors - an