In a system and method for monitoring movement, a movement monitoring device is configured to engage with a rotating belt of a treadmill. The movement monitoring device includes a rotational tracking device to measure rotational motion of the belt and send the rotational motion measurement to a computing device, and a vertical tracking device to measure vertical motion of the belt and to send a vertical motion measurement to the computing device. The system further includes a computing device for receiving the rotational motion measurement and the vertical motion measurement and to generate a Symmetry Index for the user on the rotating belt of the treadmill, the Symmetry Index being a comparison of more than one measure of symmetry for a first leg and a second leg of the user derived from the rotational motion measurement and the vertical motion measurement.
