Spika, Devon; Östervall, Linnea Wickström; Gerdtham, … - 2023
) contracts using a randomised experiment with 1629 members of a large gym in Stockholm, Sweden. We find a significant positive … impact of being offered a hard contract on monthly visits to the gym and the probability of meeting one's contract goal. Hard … and soft commitment contracts increase gym visits by 21% and 8%, respectively, relative to the control group. Trait self …