1 Department of Sport, Physical Education and Outdoor Studies, University of South-Eastern Norway, Gullbringvegen 36, Bø, 3800, Telemark, Norway. solfrid.bratland-sanda@usn.no.
2 Faculty of Health, Welfare, and Organization, Østfold University College, Fredrikstad, Norway.
3 Department of Sport, Physical Education and Outdoor Studies, University of South-Eastern Norway, Gullbringvegen 36, Bø, 3800, Telemark, Norway.