This cool new chair is not only an innovative new take on supportive seating design, it actually may help improve posture and strengthen core muscles as well.]]> Posture Improving Exercise Ball Chair Kirrashi 2008-12-31T18:27:12-05:00 chairs balance fitness exercise balance balls posture seats ergonomic training trainers gyms technology tech weird desks core muscles office cubicles design style workouts pressure spine back spinal alignment low-impact seating abdominal unique strengthen