Where to do it: As you can see in many places, from Macintosh, to Opera, to Clyde Canal and to Her Majesties Prison Barlinnie
How to do it: Never mind the graceful quality of this discipline, never mind the girls on the pictures, whether you are balled or not these formations train flexibility, sense of balance, upside- down orientation and probably some chakras somewhere.
Get a yoga manual, take to the streets and preferably choose a (sunny) spot where wall and pavement join together. Put your hands and the manual in front of you and up goes one leg. Freestyle if you can't be bothered to do it Kundalini, Hatha, Vishnumishnu etc...
Care: Warm up through being quiet. Try and stay out of the way of other pedestrians, choose a sunny day to do this as cold pavements can create great discomfort.
Equipment: None, not even a yoga mat!
Hazards/risks: People tripping over you or stomping across your fingers, falling on your head or face
Suitability for wet weather: No
Grade of difficulty: 1-10