Fitness smartwatches can be used for swimming, provided they are designed with water resistance and specific features suitable for aquatic activities. These smartwatches typically offer swim tracking capabilities, allowing users to monitor metrics such as laps, distance, strokes, speed, and even heart rate while in the water. Water resistance is crucial, and a smartwatch must have an appropriate rating, such as 5 ATM or higher, to ensure it can withstand being submerged.