As a student of Ruhr-University, you have access to the whole sports program. There are different courses during the semester and even nonterm. To take part, you need to register and buy a sports card for a small fee.
Besides that, if you are a real sportsman, you also may join the teams participating in several national and international competitions, e.g. mountainbiking, tennis, rowing, etc. Sports journeys are also offered!
Please take a look at the university sports page.