The video shows the quadruped robot trotting on a treadmill test fixture.  The legs have fixed springs.  There are no sensors or control except for the motion of the hips and shoulders.  This is a demonstration of the passive stability with directionally compliant legs.

This research project is led by robotics faculty Prof. Sanford Meek.  The project “NSF NRI grant: Biologically-inspired, hybrid quadruped robot control” is sponsored by the National Science Foundation.