A Study to Promote Physical Activity Motivation in Cardiovascular Disease Patients

"The intervention will have a duration of eight weeks. It is theory-based, will be delivered to participants' smartphones via the study app (except components 5 and 6), and comprises the following components:~1. Theory-based individualized feedback.~2. Self-generated motivational messages.~3. Motivation for habit formation through push messages.~4. Motivational images and videos that participants handed in or selected will be sent to them through the app.~5. Study-specific social media groups. Participants will be offered the option to participate in study-specific social media groups.~6. Posting motivational stories. A story of a person, who successfully changed his or her lifestyle to be more physically active and/or less sedentary, will be posted once a week in the study-specific social media groups."