We train in a large gym hall and do not have enough mats to cover the whole floor. Even if we did, there are too many dangers (radiators, bars, etc...) around the edge. So, we train in the centre which is fine apart from the mats sliding and gaps developing. There is too much time spend pushing the mats back into place.
We use 2x1m tatami mats and have no square ones. Currently, our stacking is two length, two vertical and below that two vertical and two length. The cube is then repeated.
An additional complication is that we have to clear and store them after each session so cannot just screw in a wooden boarder. Besides, wooden boarders have problems of their own.
Is there a better stacking solution?
Is there another way to stop the mats from sliding?
Just in case, the image below is not from us, but we use the same type of mats. We even have the same (garish⸮) colours.