High Quality Content by WIKIPEDIA articles! Tom Ivers, 1944-2005, was an equine physiologist and consultant who was a promoter of Interval Training primarily for Standardbreds, Quarter Horses and Thoroughbred racehorses. His book The Fit Racehorse was a radical change of approach to fitness training in horses. His later version, The Fit Racehorse II, benefits from years of practice and research and is a more extensive work. He is the author of nine books, including Optimized Nutrition for the Athletic Horse, The Bowed Tendon Book and Practical Equine Thermography.