I exercise everyday using Wijit Wheels, they are removable wheels that you attach to your chair, the wheels have a lever that you push on to propel yourself. The wheels have a built in gear so once you get moving you can really go fast with less exertion then traditional push rims. I guess my question is does anyone else out there use the Wijit Wheels and do you feel that have helped your endurance? I do about thirty minutes a day either around track or in a mall. I am a c5c6 incomplete quad post 36 years, I feel as though this is one the best exercise routine that I have ever tried. I would recommend it for those who are serious about cardiovascular and endurance.