"sprint" and "fun" dont really go in my sentences together. I do enjoy running, and during the week I do a speed work or tempo run session, w/ total distance around 6-8 miles. If you'd like to get together sometime send me a pm - I am always looking for company. Sorry, dont really know of any track clubs in zurich but I think there must be a fairly good running community here...it might just take a bit of digging on the web. My experience w/ athletic (triathlon) clubs here is that most speak German (with websites only in german) but are welcoming of foreigners. Again, just my experience, but overall been positive.