Current rehabilitative treatment of balance disorder requires long and intensive processes. The development of a wearable device for use in clinic as well as at home and during daily routine activities would enable continuous treatment outside of specialized training settings and accelerated relieve of balance disorder. The patent describes a wearable device that utilizes inertial sensors and sensor fusion processing to measure body posture and provide real-time feedback to alert the wearer to remain in the region of stability, and that utilizes wireless communication to support therapy and training providers.