In 1929, a small group of men and women threw off their clothes and began to exercise in a New York City gymnasium, marking the start of the American nudist movement. While countless Americans had long enjoyed the pleasures of skinny dipping or nude sunbathing, nudists were the first to organize a movement around the idea that exposing the body corrected the ills of modern society and produced profound benefits for the body as well as the mind. Despite hostility and skepticism, American nudists...