Fig. 2

Sensor-feedback with an avatar. a The green rectangle is kept on the upper body of the avatar, indicating that the lumbar curvature is maintained. b The green rectangle moves anteriorly to the avatar’s upper body, indicating a lumbar flexion
Sensor-feedback with an avatar. a The green rectangle is kept on the upper body of the avatar, indicating that the lumbar curvature is maintained. b The green rectangle moves anteriorly to the avatar’s upper body, indicating a lumbar flexion