There are two basic designs, one particular incorporates a back support and one which is designed to neatly fit under a desk. These chairs are best for those of people that spend long hours in front of your working personal computer or operate in a setting where you have from area to area and need to use the pressure off ft (like a doctors office). If get healthy one but are interested, advise that you locate a retailer that sells them and try one on. When you decide that you would like to purchase ...