Swim spas are large, rectangular pools that are designed for swimming, exercising, and relaxing. They are typically smaller and shallower than traditional swimming pools, and they often have a built-in current that allows users to swim or exercise against a resistive force. Some swim spas also have features such as jets for massaging, built-in seating areas, and resistance bands for added resistance during workouts. They are a popular choice for people who want the benefits of swimming or exercising in a pool, but don't have the space or resources for a full-sized pool. They can also be used year-round, as they are typically equipped with heating systems that allow users to maintain a comfortable water temperature.