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Active sitting with SISSEL SITFIT. A way to work your back-without actively excercising! - excercises muscles of back and pelvic floor - builds foot and leg muscles - relieves upper body and builds back musculature - an active, dynamic seat; sitting aid - prevents back problems and corrects poor posture - valve permits pressure variation, individually adjustable - comes with excercise poster - 0 approx. 33 cm or 36 cm