Of course I lined the gym floor with these. I moved them here from out of state when we relocated and in retrospect, I wish I had left them behind. The sheer tonnage of these bastards! They do the job, and I was lucky enough to buy them a decade ago when you could still get smooth ones (went to TSC a year ago to buy another and now they only sell them with diamond plate pattern) but if I was starting over I would use the 3' x 4' ones instead... way easier to trim and to tetris into all the corners of the basement. If I ever move this gym, I won't use the 4x6 ones again. Too much swearing and gnashing of teeth to wrestle these into place.
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