This is the "Walking of the Penguins," or WoP. It takes place at Asahiyama Zoo in Asahikawa, Hokkaido. The cute li'l Batman villains are walked twice a day for a distance of 500 meters to help them exercise. I can't personally explain why they chose not to got with my suggestion of teaching them Taekwondo - it is a phenomenal workout.
Starting next March, they will be walked only once a day, because the snow will probably be gone, and that somehow means they won't be so plump and out of shape.