Doesn't make sense to me. Freezing temperatures freeze cell walls causing frost bite. There's no amount of mind control that can counteract that. I smell a rat.
Increasing blood flow to the extremities increases the amount of core body heat transferred to the extremities. Not witchcraft, or bullshit. Basic physiology and thermodynamics.
All this guy is doing is allowing his entire body to cool at a similar rate, rather than conserving core heat at the expense of extremity heat. The net result is that you can stay exposed to extreme cold for longer before frostbite, while sacrificing total survival time. Using this technique you'll die faster, but probably keep your toes if you live.
And then there's the hyperoxigination. If you breathe fast, your blood gets more O2. More O2 means a faster metabolism. https://www.ncbi.nlm.nih.gov/pubmed/15803488 Wim Hof carboloads, and breathes fast to burn more calories.
In simple terms, this guy is overclocking his body.
Read the last line and paragraph
“You can think whatever you want but your body still freezes and you are dead,” Musik says
But It can work for short periods of time.
Makes sense. Raising blood O2 with metered deep breathing is a logical counter to the body's natural reaction to cold shock, which is rapid shallow breathing. This combined with relaxing muscles has the further benefit of helping fight another of the body's natural responses to extreme cold, which is to restrict blood flow to the extremities (a large factor in frostbite).
Its cool to see someone actually proving all this with medical science!