Shugendō is a Japanese spiritual practice that combines elements of Shinto, Buddhism, and Taoism, focusing on asceticism and the pursuit of enlightenment through mountain worship and nature. Practitioners, known as yamabushi, seek to gain spiritual power and insight by undergoing rigorous physical and spiritual training in the mountains. This unique blend of beliefs highlights the interconnectedness of Shinto and Buddhism in Japan and the role of nature in spiritual practices.