Our Designer Grip-Loc Tiles are made from a softer plastic compared to the Rugged Grip-Loc Tiles. Also, our Designer Grip-Loc Tiles are also not UV treated like the Rugged Grip-Loc tiles, which is why we don't recommend them for outdoor areas. The softer plastic used for those tiles also expands and contracts drastically, so we would not recommend using those tiles in a confined area outdoors. When it comes to working out on them, since the plastic is a little softer, you would get some shock absorbency that you wouldn't get from the Rugged Grip-Loc Tiles. To get more bounce and comfort from the Rugged Grip-Loc Tiles, we recommend adding our ShockPad under the tiles. Both would be able to support any weight put on them.