Sport is meant to be the healthiest thing in the world, and professional athletes operate at the top levels of fitness.

So why do women at the top level face stress fractures at three times the rate of their male peers? And why is disordered eating so common among this cohort?

Lauren Fleshman was a professional runner: a college phenomenon and a multiple-time National Champion in the 5000m race. Now, in her new book, Good For A Girl: A Woman Running In A Man's World, she looks back on her career, and examines what needs to change so that sport is healthy for women: in body and mind.