The QRIO robot by Sony is the fastest running robot alive.  It’s pretty coolio.

 

According to a Sony Press Release, QRIO is the first ever running robot:

 

World’s First Running Humanoid Robot


Tokyo Japan, December 18th, 2003 – Sony Corporation today announced the development of dramatically enhanced motion of Sony’s humanoid robot, enabling integrated motion control for walking, jumping and running. By applying this technology to QRIO, which is one of Sony’s technology platforms, Sony has successfully created the world’s first* running humanoid robot.

 

Running Robot: QRIO Video

 

 

Further Reading:  Kilbots Bring the Robot Apocalypse Upon Us