If you've got ice in your veins try running the Kiel Marathon. The event, held every February, offers it's participants chilly views of the Kiel Fjord as they run out and back along it's shores until they reach the finish line, 42.195 kms later.
Equipment: Bring lots of layers. The beginning and end are the coldest times so have a cheerleader standing by to take your layers as you start and give them back as you finish.
Interturk is an amateur sports club with about 500 members and mostly dealed with football. If you are living in Gaarden, or will be there for a while I advice you to visiyt there if you wish to deal with sports, especially football.