free running aka parkour, summing it up quickly it is basically people testing themselves to the extreme for example jumping over gaps or vaulting over high objects. originated in france but there is now a big movement in the uk (london especially) it was invented by David Belle and Sebastien Foucan in france near dam de lac(sp?) Although their stunts do look crazy it is a very controlled 'sport' and the idea of it is to move from place to place as fluently and gracefully as possible.