Well, I got a mat specially made for hardwood floors to use under my rolling chair. After several months use, I found that it abraded the whole area that it covered. It must have moved a bit each time I rolled the chair and acted like fine sandpaper over the entire area. Having said that, a friend got the same mat and it worked great. Might be something to do with the finish used on the floor. Don't know if an anti fatigue mat would do the same (move a bit each time you stepped on it) I'd try and see if there's one specifically for hardwoods, then check under it frequently!