It  is well-established, through extensive peer-reviewed published  research, that physical activity and exercise training can impact the  reproductive endocrine  system of women.  This ground-breaking, comprehensive title presents a  range of unique insights into the opposite question: how the  reproductive endocrine system of women affects their exercise ability.   More precisely, the thematic question explored in this  work is: if exercise affects reproductive hormones, conversely then  could the reproductive hormones have physiological effects unrelated to  reproduction that influence the capacity of women to exercise   In  exploring this question, the goal is to better  understand the unique physiology of women and whether female sex  hormones might account for some of the variance in physiological  performance between amenorrheic and eumenorrheic women, and within women  across the age span as they experience menarche to menopause.