Healthy Back 3 Inch Footrest (3 Inch) The Healthy Back 3 Inch Footrest will create constant movement in your lower body and force your back towards the back of the seat to help you sit with proper posture. The constant motion will also prevent your lower body from falling asleep. The rocking motion of the Healthy Back 3 Inch Footrest will increase circulation to the lower body. The increased circulation can help eliminate problems such as blood clotting varicose veins that come with poor circulation to the lower body. 19x12x3