There is a secret inside you which, once you understand it fully, has the capacity to unlock untold potential. Once you learn the science of your hormones, you will be able to harness it forever. 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 and what had been an inconvenience each month became a barometer for her body's health and mental happiness. When she discovered that her hormonal burnout was driven by stress, she quit her job and focused on trying to understand how her body worked, to establish why and how she had pushed herself too far. In this guide, Amy shares the research and science behind how our hormones work for twenty-first-century survival, how understanding them can help you build better and healthier routines, and why the systems and cycles inside us are an invisible but powerful force. With insights from nutritionists, gynaecologists, endocrinologists, personal trainers and others, Moody provides a holistic and practical blueprint for understanding your hormones and optimising your life around them.