Hardening is, in fact, training of the immune system. The main principle of hardening: moderation, gradualness and regularity.
Start small: walk more, ventilate the apartment more often, walk around the house barefoot, wipe yourself with a sponge or towel soaked in cool water, wash with cool water. Then you can move on to more serious procedures: dousing with cold water, a contrast shower. A contrast shower, by the way, is very useful for training the cardiovascular system, improving the condition of the skin, preventing cellulite. Just do not forget about caution and gradualness! If you already have problems with the cardiovascular system, first consult with your cardiologist.
Regularity of hardening procedures is very important, the absence of long breaks between them.
You can start hardening procedures only if you are completely healthy. Ideally – after consulting a doctor.