Satisfaction with the intervention
Satisfaction data were collected from the participants via questionnaire at two time points during their study participation. The first time was 6 weeks (post) and the second 12 months (follow-up) after discharge from in-patient treatment. The questionnaire contained questions regarding expectations, understandability of the content, satisfaction with the coach, helpfulness of the text messages, user friendliness and helpfulness of the mobile application, achieving (intermittent) goals, motivation to continue and recommendation of the intervention, suitability for health promotion, general satisfaction, and perceived effort in relation to success. These questions were all answered on a 4-point Likert scale ranging from no, mostly no, mostly yes to yes. The scale for the last question ranged from too high, mostly too high, appropriate to low. Additionally, there was a question pertaining to the perception of intervals between sessions, which was answered on a scale ranging from too long, just right to too short. Lastly, the question was asked whether a different fitness application was being used. This question was answered with yes or no.