For astronauts, extra-vehicular activities -especially on planetary surface -pose physical challenges and health risks. Therefore, monitoring the health of astronauts is of great importance.The experiment Far SiDE of the University of Innsbruck, Austria aims to develop models and systems to improve the safety of astronauts during extra-vehicular activities. It predicts the response to fatigue and investigates how fatigue increases during a mission. Measurements of heart rate, oxygen consumption, muscle activity, carbon dioxide concentration, and more will be gained when the analog astronauts perform extra-vehicular activities in the space suit simulators AoudaS and AoudaX. The relevant data will be recorded using a wide variety of methods such as near-infrared spectroscopy or electrocardiograms.