People usually associate Polar Bear Swims with celebrating the New Year and they would be right. In many countries plunging into ice cold waters has on January 1 (or a few days before or after) has been a tradition for more than a century. The first recorded Polar Bear Swim took place in Boston 1904. VancouverÂ’s annual Polar Bear Swim Club, for example, has been active since 1920.

Most of the time the event is organized for charity and other times it is a religious ritual. Christian Orthodox countries celebrate Epiphany, the birth and baptism of Jesus. A silver cross is thrown into a river and gutsy people swim to retrieve it. This is called the Blessing of the Water and symbolizes Jesus' baptism in River Jordan. Many Polar Bear Plunges across the U.S. are schedules around the SuperBowl.

Whatever the reason, thousands of people all over the world take on the challenge. Judging by the numbers, swimming in icy waters is more popular in Europe than in North America. Vancouver usually attracts between 1,000 and 2,000 swimmers (a record of 2,500 in 2014) every year while The Netherlands, in comparison, has about 10,000 at Scheveningen, the countryÂ’s main beach resort town, alone. In in Biarritz, Southwestern France, people celebrate with champagne, which they drink while still in the water.

The largest polar bear swim in the U.S. is in Sandy Point State Park in Maryland Â– the Plungapalooza. Its aim is to raise funds for the Special Olympics. The biggest swim was in 2008 when 12,000 showed up.

While these plunges are a fun way to spend the day with friends and strangers, the daring swims are not meant for everybody. They are called Â“Polar Bear SwimsÂ” for a reason. A person simply doesnÂ’t have enough fat and fur to protect the body from the freezing temperatures. The icy waters are a shock to the body. People can start to hyperventilate, heart rate and blood pressure can spike. If youÂ’re gasping for air and get ice cold water into your lungs, you can actually drown. Other risks include Â“diving reflexÂ” when the body breathes slower and the heart rate slows down (in order to save oxygen), arrhythmia, hypothermia.

Polar Bear swims are not all bad; they have a few health benefits. A dunk in the cold water increases blood flow to the organs and helps exfoliate the skin. The shock from the quick change in temperature is considered a mild stressor and it activates the immune system. The levels of dopamine, serotonin and endorphins increase.

People with heart problems, smokers, who are out of shape, and those who have been drinking the night before the swim are advised not to take part in Polar Bear plunges. Taking part can be dangerous but watching it or reading about is totally risk-free.

MSP Polar Bear Plunge in Maryland (known as Plungeapalooza)

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This year the event is celebrating its 20th anniversary on Jan. 30, 2016. The money raised will go for the support of 7,169 athletes with intellectual disabilities around Maryland. This is the biggest fundraiser of the year for the Maryland Special Olympics. The icy water plunge has become among the most popular in the country, turning it into a must-do winter event for many adrenaline-seekers.

Looney Dook at EdinburghÂ’s Firth of Forth, Scotland

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The comically-named dress-to-impress event has a bonus Â– the plunge is in the River Forth with the notorious Forth Rail Bridge in the horizon. For more than 25 years thousands of participants, also called "Dookers," and spectators swim in the freezing water to raise money for various charities all over the U.K. The fancier the dress for the swim, the better. Musicians playing the bagpipe make the event even more glamorous and exhilarating. There is a parade through the town before the plunge and people are wearing "loonies" costumes, acting jokers the best they can.

The Coney Island Polar Bear Swim, New York

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The Coney Island Polar Bear Club is the oldest winter bathing organization in the country, founded in 1903. The founder, Bernarr Macfadden, believed that a dip in the ocean in the cold winter can boost a personÂ’s endurance, virility and immunity. Donations reached $70,000 last year. The money is used to help children attend Camp Sunshine, a retreat for children with life-threatening illnesses.

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