Does the 8mm flooring for a home gym have to go wall-to-wall or can it be used for a 12'x12' "mat"? The room is very large, and we do not need it all to be covered.

You can install our 8mm Strong Rubber Tiles as a mat or as a whole floor. The tiles interlock together, and due to the weight of all the tiles interlocked together, the flooring will not move when in use. If for some reason the tiles did move when not installed wall-to-wall, recommend placing some double-sided tape or glue around the edge of the mat.