Dynamic stability is a measure of the ability of a robot to maintain its balance while in motion.

A robot with two or three legs, or that rolls on two wheels, can have excellent stability while it is moving, but when it comes to rest, it is unstable. A two-legged robot can be pushed over easily when it is standing still. This is one of the major drawbacks of biped robots. It is difficult and costly to engineer a good sense of balance, of the sort you take for granted, into a two-legged or two-wheeled machine, although it has been done.

Robots with four or six legs have good dynamic stability, but they are usually slower in their movements compared with machines that have fewer legs.

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