Changes in accelerometer-measured physical activity and self-reported leisure time physical activity from adolescence to young adulthood: a longitudinal cohort study from the Fit Futures Study. - Hammer, Tord Markussen; Johansson, Jonas; Emaus, Nina; Furberg, Anne-Sofie; Gracia-Marco, Luis; Morseth, Bente; Nilsen, Ole Andreas; Ubago-Guisado, Esther; Vlachopoulos, Dimitris; Weitz, Marc; Evensen, Elin; Christoffersen, Tore (International Journal of Behavioral Nutrition & Physical Activity, 2025)