Some reviews say the 8mm tiles come apart easily when rolling heavy gym equipment on them. Will this happen when moving a weight bench around on the floor?

As long as our 8mm Sport-Lock Rubber Tiles or any rubber tile is installed over a hard flat surface, the tiles will not come apart when moving heavy equipment over the floor. When installed over a plush, high pile carpet with a thick pad, the tiles do tend to come apart. If you are installed over plush carpet, we recommend placing a 1/4" plywood board under the tiles.