Trainings
The three trainings were delivered by experienced instructors and followed the same structure: they started with an introductory session of 1 h that was followed by two group sessions of 2.5 h of duration each. The three sessions took place over a 5-week period and were complemented with 20 min of guided audio recordings for daily listening during the training. All interventions were equal in time and procedure and took place in rooms of the University of Geneva in order to maximize the similarity between them. Furthermore, the instructors were not involved in the design, analysis, or writing of the study. To control for training adherence, participants were asked to log into a platform daily to specify how many minutes they listened to the audio recordings, as well as to indicate the amount of informal practices during the intervention period (i.e., application of the learned techniques in everyday life). Researchers encouraged participants to engage in daily practice of their respective trainings routines to maintain a consistent practice (see 