Efficient legged motion is achieved by utilizing natural physics and dynamics rather than just relying on computer control to counteract forces.

“How do you build something so that the physics of the machine just kind of inherently wants to do what it wants to do and he was building these springy pogo stick type you know his first cut at Lego Locomotion was a pogo stick”

Legged robots should be designed to be aggressive and dynamic rather than static and cautious.

“I just looked at that and said wow that's wrong you know that's not that's not anything like how people and animals work because we bounce and fly”