Mark Todd's eventing career is the stuff of legends and encompasses one of the greatest sporting comebacks of all time.When he "retired" from competing in eventing in 2000, he had already been named "Rider of the Century" for his natural empathy with a horse and his extraordinary success, which included back-to-back Olympic gold medals, five Burghley wins, and three Badminton victories. He has also show jumped to Olympic level and trained winners on the racecourse. Considered a legendary horseman by his peers, he seemed to have done it all. He returned to train racehorses in his native New...