Inertial footpod

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An inertial footpod is a device used to track running measurements such as speed, distance travelled, pace, etc., which would generally only be available on treadmills or with a GPS unit.^[1]

This device is usually small and attaches to a runner's foot. It uses one or more accelerometers and processes several times a second to compute speed.

One example is the foot pod employed by the Polar S625x running computer.