practitioner seat boogie ruckPractitioner's chair Boogie A stool with all the benefits of the proven Bioswing chair. The stable star shaped base, easy to steer wheels, and innovative Bioswing system guarantee completely relaxing sitting. Comfortable seat with contoured padding for a perfect sitting position when changing positions during work. Individually adjustable pelvic support to stabilize the pelvic area. Continuously adjustable seat height by means of a gas spring.