US Patent 9558399 Feedback device to improve arm swing

A device configured to provide biofeedback on arm swing during walking, running, or other movement activities is disclosed herein. The device includes motion sensing means configured to sense the motion of an arm of a user during a movement activity and output one or more signals based upon the sensed arm motion; computational means configured to compute an arm swing angle of the arm of the user using the one or more signals outputted by the motion sensing means; and one or more signaling devices operatively coupled to the motion sensing means and computational means, the one or more signaling devices configured to emit one or more signals to the user that are based upon the computed arm swing angle of the user so as to provide biofeedback to the user regarding arm swing. The use of two devices, one on each arm of a user is also disclosed herein.