By 
Participants of an event at Seoul Plaza are producing electricity by pushing a round-shaped wagon on Monday. The event was hosted by Korea NGO
Via KBS Global.
I actually watched a documentary on PBS Frontline on these wheels known as PlayPumps that ended up being a big con on the people of Africa that got stuck with them.
4:43 pm on August 30th, 2010 1
It looks like one of those exercise machines they put in parks all over Korea.