When I returned to France after my exchange year in Granada, I joined the local ESN section. We organised activities for international students (not only Erasmus), trips and hikes to discover the region (Strasbourg, Metz, the Vosges, Lyon, etc.) but also cultural, artistic, sports and festive activities! It allowed me to extend my Erasmus exchange and at the same time I discovered new things and ways of working which changed my professional orientation. It's not just about partying, learning a language and visiting a new place for a few months. It brings so much more!
What to do after school classes?
The Université de Lorraine has an extremely good sports programme for every student in Nancy! Its name is SUAPS. It consists in paying 10 EUR (maybe more expensive nowadays) per year to have access to a lot of sports classes such as volleyball, basketball, football, tennis, swimming, martial arts and even circus jugglery. Normally, every Thursday at afternoon students don't have any classes so they can practice a sport or do some physical activity in any sports centre in the city thanks to this programme!