Sitting is the preferred position for reading and computer work, but sitting motionless is unhealthy. Our body is designed for motion, and we need movement throughout the day to support a healthy metabolism and a strong, supple back. But what kind of movement?The human body has one primary strategy for movement: walking. This means that the supporting muscles and structures of the spine are highly adapted to the constant alternation of force from side to side, and research has identified this motion as the key to back health. Sitting motionless fatigues your back muscles, leading to slumped sitting postures and a stressed lower back. The Core-flex seat allows just enough movement to tilt the pelvis and stimulate muscles of the legs and core. The results are greater comfort, an active core, better posture, and more calories burned, for every minute that you're sitting. See more at http://core-flex.com/pages/healthy-sitting-guide