Medically prescribed physical activity (PaP) is a relatively unknown term, howeverit is nothing new. Being used as an alternative to traditional treatment it aimsto reduce the use of chemical medication where possible. This method has provensuccessful on diseases such as high blood pressure, heart attacks, diabetes, depressionetc. Issues with this treatment stems from the fact that as it is today, it is moreinconvenient and harder to follow up with than the alternatives.In this study we have examined an alternative method to treat people with PaP bydeveloping an AI coach for a PaP-focused smartphone application which’s goal it is tomotivate the patients to fulfill their PaP-schedule. We perform both an experimentwith the usage of the developed AI, as well as a literature study in order to evaluatethe efficiency of an AI coach in comparison with today’s method of real life meetingsand little to no contact between patients and prescribers. With this paper we showthat having an AI-made coaching messages can increase the motivation of the usersof a PaP-focused application.