The Outcomes of a 12-Week Internet Intervention Aimed at Improving Fitness and Health-Related Quality of Life in Overweight Adolescents: The Young & Active Controlled Trial Riiser, Kirsti, Løndal, Knut, Ommundsen, Yngvar, Småstuen, Milanda Cvancarova, Misvær, Nina, Helseth, Sølvi (2014-12-05)