@article{BrandCheval2019,
  author    = {Ralf Brand and Boris Cheval},
  title     = {Theories to explain exercise motivation and physical inactivity},
  journal   = {Frontiers in psychology},
  series    = {ways of expanding our current theoretical perspective},
  volume    = {10},
  doi       = {10.3389/fpsyg.2019.01147},
  year      = {2019},
}