Our Diamond Soft Tiles can be installed over concrete or any other hard, flat surface like asphalt, plywood, existing floors, and the like. You don't need to use any adhesive with these tiles as they are meant to be installed as a floating floor. These tiles interlock together tightly helping to keep them down and in place. You can place a treadmill or other fitness equipment over these tiles. Since these tiles are made of foam, they will show impressions where the feet of the equipment sit. We recommend to prevent these impressions, to use furniture sliders under the fitness equipment feet.