Inclusion Criteria	Exclusion Criteria
Original empirical data	Protocols, commentaries, editorials, conference abstracts, calls for research, letters to the editor, proceedings, book reviews, textbooks, replies from author, erratum, doctoral dissertations, master’s or bachelor’s theses, and opinion. Studies based on author’s reflections on own experiences.
Examines long-distance walking	Studies where the notion of long-distance walking is used in the context of exercise tests examining walking capabilities (e.g., 6 min walk test, 12 min walk test, long-distance corridor walk, shuttle-walk test), or studies where the notion of long-distance walking is used in the context of walks to school or as porters (i.e., where the walk is not viewed as a recreational activity). Studies on pilgrimage that do not include walking (only other modes of traveling or where walking is performed in combination with other forms of travel, and results are not presented for the walk specifically) or where the mode of travel is not specified. Studies on “walkers” or where data on “hikers” and “walkers” are mixed, but include studies where hikers/long-distance walkers, etc. are undertaking, e.g., “day-walks”.
Examines how long-distance walking was related to mental health	Studies on mountain/altitude/high-altitude sickness/illness, headache, etc., where the health aspect of the walk was described only in terms of somatic symptoms. Studies on long-distance walkers, where their mental health or mental states are not examined in association with the long-distance walk.
Adult population (18+ years)
English, Danish, Swedish, or Norwegian language