Pressure on healthcare is increasing due to ageing and growing numbers of chronic diseases. Therefore, many people take part in rehabilitation in which they receive supervised physiotherapy, while they are also encouraged to practice independently. However, simple technologies can support independent practice at home. With Augmented Reality (AR), digital images can be projected into the real word. In this way exercises can be practiced through games. Simultaneously the progress of the exercises can be closely monitored. This makes practicing more fun and directly measurable. The aim of this testcase is to determine the validity, reliability and feasibility of an AR-headset.