I am working out on carpet over concrete. I was wondering if you could recommend an inexpensive flooring option for aerobics and step, such as a mat, that could be easily layed down when working out and tucked away when not in use.
I had to do the same for a while in my workout area. Go for puzzle mats. ( FYI the BJ's ones are too thin.) I bought them and had to double them. Try for a thicker one that you can take up as needed. And when you are ready to replace that floor go for a floating sub floor and hard wood over it. We recently made the switch hand the difference is amazing.