What a fascinating book! Scott Carney masterfully narrates a personal voyage into the cosmos of consciousness, as he tries such wildly disparate things as kettlebells, breath control, hallucinogens, and potato diets, and synthesizes them into a compelling common theme: the space between stimulus and response contains perhaps limitless potential. Carney infuses his writing with infectious curiosity and healthy skepticism, assuming the role of an intrepid explorer who seeks the truth, whatever it may be, and by any available means. This book was a page-turner for me both due to the subject matter and to Carney's writing style. But more than that it inspired me to experience a sensory deprivation float firsthand!