The Guardian has an interesting article on a sport called Parkour, which seems to involve jumping around on roofs, walls, roads, pavements, basically anything you can find. You may have seen an example of this if you saw the recent BBC promotional film. Luc Besson has made a film about it. There is also a US based site with some videos.
A way of adding an element of risk back into life, which these days can seem too safe?