The machines in Terminator weren't really that smart — they tried to get around on just two legs. Those working on robotic designs for the US military know better.
Meet Cheetah, the machine that has broken the land speed record for robots with legs. This video shows him on a laboratory treadmill beating the previous record set in 1989. Don't get too excited though. The previous record was 21kph — with a top speed of 29kph, Cheetah is hardly the military's most feared weapon.
Still, it looks pretty cool and the folks at the Defense Advanced Research Projects Agency hope to have it off the treadmill and running free later in the year. You can see from the video how it mirrors the running motion of an actual cheetah ... it's just four times slower.
There's another option, of course. Stick some wheels on it.