Can I use it in a residential garage that will double as a workout room. We will be parking a car on it also.

Our 8mm Strong Rubber Tiles - Designer Series can be installed in a garage. If a car is parked over them, you would have to make sure no oil from the car gets on the flooring surface. Oil from the car can cause the floor to break down. Our rubber tiles are not the best product for this application due to separation that can occur when a car turns it wheels on the floor, but can still be used for this dual purpose. We do have these same colors in a roll format that will work better and we do also offer softer PVC tiles that will better handle the oils from the car and tires. Those tiles are part of our Flex Tile series.