Yes! You can use the tennis trainer both indoors and outdoors. It’s perfect for practicing outside on your driveway, patio, or at the park. For indoor training, you can set it up inside a gym, garage, or any spacious room, making it ideal for year-round use, no matter the weather.To safely play indoors, you'll need at least 15-20 feet of space depending on how far you are from the base. But don’t worry—the string is adjustable, so you can easily shorten or lengthen it to match your available space.