Understanding variations in exerciseidentity strength through identity theory and self-determination theory Shaelyn M. Strachan a , Michelle S. Fortier b , Mélanie G.M. Perras b & Carrie Lugg b a Faculty of Kinesiology and Recreation Management, University of Manitoba, Winnipeg, Manitoba, Canada b School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada Version of record first pu...