A wearable device for determining balance of a user is provided, comprising a gyroscope, an inertial measurement device, a memory storing instructions, and a processor configured to execute the instructions to perform operations, comprising receiving angular velocity measurements over a period of time from the gyroscope, receiving deviations from the second axis over the period of time from the inertial measurement device, weighting the deviations from the second axis based on directions associated with the deviations, receiving deviations from the third axis over the period of time from the inertial measurement device, weighting the deviations from the third axis based on directions associated with the deviations, and based on the angular velocity measurements, the weighted deviations from the second axis, and the weighted deviations from the third axis, determining an index associated with a left side of the user and an index associated with a right side of the user.