Dr Leah Lagos, Psy.D., B.C.B is an internationally renowned sports psychologist and performance coach who has dedicated over fifteen years to researching how heart rhythms impact mental and physical performance. In this ground-breaking book she shows that it's not your thoughts that are causing stress hormones to flood your system, or a lack of mindfulness that's creating your erratic heart rate and breathing pattern. It's the way your body is hard-wired to react to stress. In other words, your stress is not in your head; it's in your body, and it all begins with the heart. Based on the latest science on heart rate variability, Dr Lagos has developed a life-changing programme, which has helped thousands of her patients - elite athletes, chess champions and international CEOs alike - to control their heart rhythms and rewire their bodies baseline response to stress. These high-profile clients affirm that her pioneering protocol has not only enabled them to perform at their full potential, but it has also unlocked their happiest, most productive selves. INVINCIBLE includes a take-home version of Dr Lagos' results-driven, ten-week programme so you, too, can learn how to reduce your physiological response to stress, manage external pressures and start embracing new challenges.