A Longitudinal Study Examining Physical Activity Habit Formation. - McAlpine, Thomas; Liddelow, Caitlin; Charlesworth, Jessica; Mergelsberg, Enrique; Green, Astrid; Novoradovskaya, Elizaveta; Franz, Teagan; Haywood, Darren; Baughman, Frank D.; Breare, Hayley; Mullan, Barbara (Behavioral Sciences (2076-328X), 2026)