Roboticists are always looking for new tools to test their designs. Tuff Tread’s Treadmills are designed to test robot locomotion. As you can see in the below video, they can be used for bipedal and quadrupedal robots.
These guys can make custom treadmills with top speeds up to 60mph and belt widths and lengths up to 9 feet and 25 feet respectively. Decline/incline options are available from -20% to 40%.