To enable a competition horse to give its best performance it is essential to provide the horse with a combination of correct feeding and exercise. The aim of this work is to explain in simple terms the changes that take place in the horse's body during exercise and training; this knowledge can then be used to devise suitable training programmes for disciplines as diverse as long distance riding and three day eventing. This text should be useful for horse owners, where the new edition has been generally updated and includes results of the most recent exercise physiology research.