practitioner chair stool bioswing ruckPractitioner's chair STOOL BIOSWING Ruck With the STOOL BIOSWING, you can do a lot for a healthy back while sitting. The unique pendulum principle allows movement from all sides and returns energy. With this function, you strengthen and stabilize your back muscles completely unconsciously. The backrest adjustment ensures optimal adaptation to your body measurements and the seat depth adjustment (5 cm) for the correct seat depth. The seat and backrest