“Dr. Sian Belock is one of the world’s leading researchers in human performance. In her book Choke, she explains with great insight the scientific underpinnings involved in individual triumph and failure–whether these take place in the world of sports, academics or business. The reader arrives at a rich understanding of why and when people choke and more importantly how to achieve one’s best in the competitive world. Choke is destined to be a classic in the world of human performance and is a must read for those who seek excellence in all domains of life.”