It will cost you a lot of discipline and willing to change everything in your life. From the way you breathe, eat, think and even take showers.
But you will gain conscious control of your immune system.
Here's a brief introduction to who is Wim Hof and inside there's a link to the method.
https://highexistence.com/the-wim-hof-method-revealed-how-to-consciously-control-your-immune-system/
However if you don't feel like shelling out 250 USD, you can torrent the whole video course.
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