I have been holding off on this post for about a month, trying to come up with a solution for my arthritic knee problem. My shop is in the basement, on a concrete floor. I have one 3X5 mat that I move around if I remember. I wear an old pair of New Balance with my orthodics. I have been pretty bad the last week so I have not been in my shop. From all the experience out there, has anyone with similar problems, come up with a solution. I am thinking a very comfortable pair of shoes, along with some kind of special flooring would be help. Thanks in advance for any input.