There is a town swimming pool near my soon-to-be college Hild Bede. I think several colleges have their own gyms, HB certainly does. At any rate, there are so many sports on offer at Durham in terms of societies and facilities, you are sure to find enough activity to keep trim if you can make the effort! And then there is always crazy dancing at Klute and Rixies to work off that alcohol whilst you're still drinking it!