Official rules of the Scottish Cyclist: cross training

20. Generally any physical activity other than cycling is encouraged, especially if it is outdoors. Cycling of course, should be preferred at all times, and if The Scottish Cyclist does indulge in other sports, he must be careful not to overdo it. Sports that are approved by the Scottish Cyclist Rules are fell running, cross-country running, Munro climbing and swimming across lochs.

Official rules- full list