Ullyot was an
exercise physiologist associated with the Institute of Health Research in San Francisco, and a project director at the Research Institute of Laboratory Medicine at the Pacific Medical Center. In 1976, she published the book ''Women's Running
, in which she countered common arguments that women were not built for running long distances. It was one of the first books discussing this topic. and an updated edition of her first book, The New Women's Running
(1984). She also wrote a column in Runner's World'' magazine, and consulted and lectured on women's nutrition and fitness. When the
IOC program committee asked for "further studies on the physiological and psychological effects of competitive marathon running on women" in April 1980, Ullyot compiled medical evidence to make the affirmative case for including the marathon in the Olympics. In response, the IOC program committee approved the marathon at their next meeting in February 1981. ==Running==