@article{FuezekiSchroederGronebergetal.2021,
  author    = {Eszter F{\"u}z{\´e}ki and Jan Schr{\"o}der and Jan David Alexander Groneberg and Winfried Banzer},
  title     = {Online exercise classes during the COVID-19 related lockdown in Germany: use and attitudes},
  journal   = {Sustainability},
  volume    = {13},
  number    = {14, art. 7677},
  pages     = {1 -- 14},
  doi       = {10.3390/su13147677},
  year      = {2021},
}