Mary Bromiley explains the science of fitness and how the latest scientific knowledge can be applied to achieve various levels of conditioning, both of horse and rider. Training is as important for the rider as the horse in order to create a winning combination. The author, who is an expert on both human and equine athletic performance, with many winners - horses and jockeys - to her credit, carefully shows how the performance of each can best complement the other and how correctly chosen tack can provide a competitive edge.