To our knowledge very few, if any, studies evaluates the use of modern technology in longterm follow-up focusing on maintaining a new lifestyle after participating in CR. The investigators would like to evaluate the effect of an dynamic application (app) with regard to physical fitness, lifestyle and quality of life (QoL), one year after CR. The investigators hypothesize that patients getting Access to a dynamic Application and tailored feedback through the application after CR will better be able to take care of physical Fitness and other lifestyle factors one year after CR, compared to patients getting usal care.