Yes, a Bluetooth 6DOF accelerometer/orientation sensor/magnetometer affixed to each shoe and you're sorted. I've long wanted to see a pair of such sensors set u

Yes, a Bluetooth 6DOF accelerometer/orientation sensor/magnetometer affixed to each shoe and you're sorted. I've long wanted to see a pair of such sensors set up as MIDI controllers. If you're using them on uneven or moving surfaces you might want separate sensors for heel and toe.