Hey, my name is Mena and I came from Syria to Germany. I'm not allowed to start working now. That's why I'm searching for some activities like sports, just to meet some new people here in Berlin. Would be very happy about ideas and suggestions!
There is a place called "Beach Mitte" near to the trainstation "Nordbahnhof". They do a lot for the refugee relief by collecting sportswear and arranging free Beachvolleyball-lessons for refugees. I'm not really sure what they'll do in winter but I can ask for you!
I found a group, that looks like it is organised in english:
Moreover there are Apps like Freeletics for outside sports and Dashr where you can specifically find people to run with.
I hope this is helpful in any way.