This project aims to provide data on post-exercise fatigue after single exercise sessions with endurance training and muscle strength training, each with two different intensities. For endurance training; post-exercise fatigue will be assessed after one session of high intensity interval training, and one session with longer duration of moderate intensity. For muscle strength training, fatigue will be measured after one session with high loads/few repetitions and one session with low loads/many repetitions. In addition, changes in sub-maximal and maximal metabolic and ventilatory responses to a maximal cardiopulmonary exercise test on a treadmill (CPET) and association to sarcoidosis-related fatigue before and after a 4-weeks exercise training period will be studied.