A physical exercise device has been advertised on televisions that employs casters or wheels. And, in the advertisement, the person demonstrating the device rolls it back and forth over carpeting in the exercising process. Rolling wheels or casters of any type or size—from desk chairs, roller skates to wheelchairs— over carpeting produces a rippling effect in the carpet backing. In time, repeating this practice will cause the backing to separate, ruining the carpeting. When wheels are unavoidable, the carpeting should be not be installed over pad but glued directly to the subfloor. Of course, with desk chairs, the problem can be eliminated by simply placing a desk -chair pad between the chair and the carpeting.