Swimming on an ice floe on the river or the sea is a Russian way to raise the level of adrenaline in the blood. Annually on TV, they talk about fishermen, who are waiting for rescue on a melting ice floe.

https://s9.postimg.org/h7gp2mdan/IMG_20180402_124130.jpg
pics

My colleagues from the emergency trauma every year help the victims with frostbite of the hands and feet.