Conveniently located between the city center and the Hochschule / Beutenberg, opposite a grocery…read morestore and next to a kebab place. Fair prices, easy to join, always very clean, and full of fun and friendly people. Foreigners welcome. Plenty of free-weights and bars, big windows, hot showers, a cross-fit area, lots of cardio machines... and even a tanning bed if you are into that. Best of all, it's open until midnight on weekdays and until 10 on weekends including Sunday, a rare treat in Jena. Recommended!