In the Czech Republic, there is an established time limit of 22 minutes for winter swimming and a mandatory physical check-up that includes a load test to measure heart performance. As both an incentive and safety check, there are also established performance levels in water less than 40 degrees: swimmers reach the third level by swimming 100 meters; the second level by completing 250 meters; the first level with a 500-meter non-stop swim; and the master level with a swim of 750 meters. Swimmers must graduate from each level before they are allowed to advance.
The optimal swimming time is 10 to 15 minutes, but even the extreme end has extremists. "In winter, the temperature of the open water drops to 32 degrees. Some people swim in such temperatures for up to 22 minutes," explained Bright. "We swim up to 1K in near freezing water sometimes. There is the Czech Cup with races every weekend through the winter with rules that have been developed over 50 years."
Even with the endorphins kicking in, there are still inherent risks in extreme swimming. Doctors, support boats, divers, ambulances and standard emergency equipment are present at these events. After extreme swimming for short periods, the cold can be felt in your hands and feet long afterward. Many people experience awkwardness and reduced coordination when exiting the water.
Some people prefer breaststroke while others do regular freestyle. Some swim head-up freestyle to start. But, no matter how hardened you are, the cold water is still a shock. Hyperventilation and ice cream headaches are common but part of the experience.
Proper re-warming after the swim is critical. Getting indoors, dry and dressed are your first priorities, then drinking hot liquids to re-warm the body from within. As you venture back to shore, smiles and an inner glow are guaranteed.