It’s written all over their faces, no? The pure pleasure of doubling on a bicycle. The wind against your face, the rush of adrenaline as you avoid pedestrians and other cyclists as you try not to fall off the back!! I happened to see them approaching from far off so I discreetly took this picture just as they passed by…. not that they would notice little old me and my tiny Canon p&s camera!!
This is very common in Japan, as you can tell by this other doubling act caught by a National Geographic photographer. In both images, the girls riding on the back are wearing heels, and neither are standing on some well structured, meant-for-doubling-stands or anything like that. What can I say? When it comes to two wheels and heels, Japanese girls have skills!! Thanks @cyncerest for the link!!