Winter swimming, also known as cold water swimming, is an activity that involves immersing oneself in cold water, typically below 15°C. It's a popular sport among those who seek to challenge themselves and experience the invigorating feeling of the cold water on their skin. This activity is also referred to as ice swimming or open-water swimming in winter. Some synonyms for winter swimming include polar swimming, arctic swimming, sub-zero swimming, and cold plunge. Regardless of what it's called, winter swimming is a unique experience that requires a lot of physical and mental preparation, making it a great way to get out of your comfort zone and discover a new level of health and fitness.