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In water this cold, especially without a wet suit isn't without risks. >> you swim the same way you do in regular swimming, but you need to keep breathing, so when you get in cold water, you have to train to breathe very quickly. >> you need to remember it's mind over matter, you're not going to die, if you stay in too long, you can get hyper thermic, obviously, but the trick is not to do that. >> it's not as bad as i thought. >> reporter: over 400 swimmers compete in various short distance races. >> it's breaststroke and free style and then you have butterfly. in butterfly, it's special becau...

Condition. >> reporter: but swimming in water this cold, especially without a wet suit, isn't without risks. >> you swim the same way as you do but the difficulty is breathing because when you're in cold water, your lungs cramp so you have to train to be able to breathe very quickly. >> when you get into the water, you need to remember it's mind over matter. you're not going to die. if you stay in too long, you can get hypothermic. >> it wasn't as bad as i thought. >> reporter: over 400 swimmers compete in various short distance races. >> it's breaststroke, it's freestyle. for the first time w...

Winter swimming championship, one of the coldest swimming competitions in the world. >> a lot of spectators coming to watch it every year. they come from everywhere because they want to see these brave people suffering in the water. >> studies have shown swimming in cold water can improve mental health, promote healing and improve circulation. >> it's a good way to strengthen your body, to strengthen your mind, to be ready for extreme conditions. >> swimming in water this cold, especially without a wet suit, isn't without risks. >> you swim the same way as you do in regular swimming, but the d...