The book is an edited collection of papers presented at the 5th World Congress on Science and Football. It represents the latest scientific research into the variety of sports known as football/soccer. These include the games of Association football, the rugby codes (Union and League), the national codes (American, Australian and Gaelic). The overall purpose is to bridge the gap between theory and practice related to these football games. Contributions are from leading international experts in the fields, coming together to report their latest findings and raise awareness of current issues relevant to scientific study of the different football/soccer codes. The best of the material from the 5th World Congress of Science and Football at Lisbon (April 2003) will provide valuable information for coaches, players, trainers, managers, medical and support staff, and scientific workers concerned with football.