It’s winter in New York City. The air temperature hovers just above freezing. A man puts on his wet suit and prepares to ride the waves at Long Beach, an area southeast of Queens where he lives. As he faces the water, he meditates on avoiding danger and prays to the ocean gods. His surfboard—a 9-foot Hawaiian-made job—features a picture of his now-deceased spiritual guru. The man says of the image, “It keeps me centered.”