Osteopath Vladimir Zhivotov told how swimming in too cold water harms the body.
Hardening is certainly a useful method for preventing various diseases and increasing immunity. However, it is important to feel the edge and not subject the body to too high overloads.
“Hypothermia or hypothermia is a violation of heat transfer, which is manifested by a significant decrease in body temperature below 35.5C, and can occur in water below 26C. And the lower the water temperature, the faster and more acute the critical condition occurs,” the expert says.
Hypothermia can be mild, moderate and severe.
One of the main signs that the body is overcooled is trembling, speech difficulty due to spasmodic muscles, pallor of the skin.
Further on, lethargy and a deceptive feeling that you have already warmed up may begin. In a critical state, a person can no longer give an objective assessment of what is happening.
Of course, swimming in a cool pool is unlikely to be fraught with such serious consequences, but problems are inevitable.
Because of the large heat loss, first of all, the kidneys will suffer. Warmth is needed to maintain the health of this organ.
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Be especially careful if you decide to cool off in an outdoor pool or poorly heated pond. Control the kids. In summer, the temptation is great and you really want to freshen up.
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Swimming in a cold pool is especially undesirable for those who already suffer from reduced kidney function. 
Vladimir Zhivotov Health Osteopath