The aim of this study is to examine the long-term (3-5 year post intervention) effects post individualized follow-up with an app for one year, compared to a control group that received usual care on factors related to healthy behaviour in patients post-CR.

Recently, our research group demonstrated that individualized follow-up with an app for one year post-Cardiac Rehabilitation (post-CR) significantly improved exercise capacity, exercise habits and self-perceived goal achievement compared to a control group receiving usual care. To prepare for real-world implementation of an app to promote healthy behaviour post-CR, we will investigate the long-term effects (3-5 year post intervention). The aim of this study is to examine the long-term (3-5 year post intervention) effects post individualized follow-up with an app for one year, compared to a control group that received usual care on factors related to healthy behaviour in patients post-CR. We hypothesize that patients allocated to the intervention group post-CR have internalized healthy behaviour and therefore have significantly higher exercise capacity and lower bodyweight compared to the control group, 3-5year post intervention.

Inclusion Criteria:

• Included in the RCT of which this study is built on

Patients participating in cardiac rehabilitation. The sample in this study will be the same as in the RCT of which this study is built on (ClinicalTrials.gov NCT03174106)