This Blayse rubber interlocking floor mat with connectors is heavy duty. It is set here in front of a work table to support standing in front of it. It will only be fully assembled in this configuration. I attempted to assemble all in a row but there were not enough border pieces.

I got this to set my fitness equipment on and it will definitely serve that purpose. You can leave it as a square or configure it how you’d like, however, be aware that you only have enough trim finished pieces for the square shape. Also, you can see from the picture that one trim piece just won’t attach securely—it wasn’t the piece itself but how the whole thing went together (believe me, I tried with several other pieces). That really doesn’t matter to me, though, so I’m fine with it.