Cold water swimming, also known as winter swimming or ice swimming, involves immersing oneself in water that is typically between 0°C to 10°C (32°F to 50°F) in temperature. While it may sound daunting to jump into such cold water, there are actually many benefits to be gained from this practice. You’ve probably heard all about it from your friend who reads the Guardian. But beneath the surface, there are some serious mental and physical benefits to be had. After all, there must be a reason all those people are hurling themselves into freezing cold water.