Sufficient exercise provides important health benefits, especially for people with lung problems. With the m-PAC application, developed by KULeuven, we coach you towards more physical activity in daily life. The m-PAC application, linked to a pedometer, records your daily activity expressed in number of steps per day. With the help of your coach, you will receive a personalized coaching program, adapted to your capabilities. With the login you received from your coach in the m-PAC app, you can get started immediately. KULeuven offers patients with lung problems a scientifically substantiated way to work on their physical activity.