I am looking for a mat for a garage gym. Would these mats be ok to have a car parked on them?

You can park a car on our 1/2" Premium Mega Mats. These mats are vulcanized mats meaning they are super durable. The only thing you would have to worry about would be oil falling on the mats. If oil were to fall on the mats and left there for a period of time, the oil will eventually breakdown the mats. If your car does leak oil, we recommend placing our Nitro Roll or an AutoFloorGuard Mat under your vehicle.