Nick Powell, a specialist in human optimization, discusses biohacking towards optimal health and exceptional performance. As described in his book Limitless, he synthesizes the research and programs and tells us how to biohack our way to optimal health. He discusses the role of sleep, diet, meditation and exercise. including strategies on. fasting, smart drugs, light therapy, Heart Rate Variability training, toxin exposure, cold therapy, ketogenic diets and time-efficient exercise