Germans (and Müncheners, in particular) spend as much time outside as possible. In summer and winter, the English Garden is crowded and there are major traffic jams out of the city on Friday nights and back in on Sundays to the lakes and mountains. Having an appropriate amount of fresh air ("frischer Luft") is an important part of daily life, and a very frequent source of office conflict over opening the windows in winter!
So, it's no surprise that sports still go on in the winter. Not only sledding, skiing, ice skating and the other snowy sports, but also the ones we think of as summer sports.
Soccer....
;)
American Football....
(we stumbled upon the end of the Starnberg Argonauts' practice and Herr J joined in to show them some perfect spirals)
;)
Biking, walking dogs/children, and running....
;)
and even Surfing....
(surfers catch the wave on the Eisbach year round)
;)