The Okinawans attribute their health and longevity to a couple of words, ikigai and moai. Ikigai means "that which makes one's life worth living." Moai means that one has a social support network. "Having lifelong friends is key to shedding stress," Dr. Oz says. Daily exercise and gardening are a few ways in which 84-year-old Fumiyasa Yomikawa gets his ikigai.