Its been a week of putting a 1x2x3 board on it with weights and it still wants to curl up. I don’t want to use duct tape. I have to move it to mop so fastening it the floor is out. It is commercial grade and idk why it wont relax on the ends.
(This is a stock picture of the same mat.)


Use carpet tape (double-sided tape that’s meant for sticking rugs to the floor) to fasten stiff squares of material to the undersides of the corners. The stiff material will keep it from curling, but it won’t be stuck down to the floor so you can still move it.
I was going to suggest gluing a thin, flat strip of metal around the edges, but yeah, anything stiff would serve the same purpose.
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Yes. I addressed that. Fasten it to flat pieces of stiff material, not to the floor. The stiff material keeps it from curling but can be moved.
I have to move it to mop so fastening it the floor is out.
I addressed that. I’m not proposing fastening it to the floor.