Hormones were something Amy Thomson, founder and CEO of leading women's health app and tech service Moody, never paid attention to, until one day her periods stopped. When she discovered that her hormonal burnout was driven by stress, she quit her job and focused on trying to understand how our hormones can work for twenty-first-century survival. In this eye-opening guide, Thomson draws upon leading research from nutritionists, gynaecologists, endocrinologists, personal trainers and others to explain how understanding our systems and cycles can help you avoid burnouts, build better and healthier routines and optimise your life.