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.)


These things usually are stored rolled up, and they curl when new because of that.
Usually they’ll lay flat in their own inside of a week. I have seen people hasten that with a heatgun or small portable room heater- just enough to warm it a bit.
I’ve also seen people melt them trying that.