I did the WHM for 1000 days a few years ago. I can definitely say my cold tolerance has increased, even after stopping the breathing, cold showers, etc...
I look at it like how a boxer reprograms themselves not to flinch when a punch is thrown at their face through repeated conditioning. Instead of instantly regretting the cold, you learn to accept it and not pre-program your reactions to it. Since most people live in 70 degree temps all the time, walking out into sub-freezing weather with minimal clothes is an instant shock to them.
I am just some weirdo that walks around in the cold barefooted and in shorts all year around, and no expert in reprogramming their parasympathetic nervous system or commanding my white blood cells to attack things. The WHM method just allows me to do it longer and in colder weather. YMMV and all that.
I look at it like how a boxer reprograms themselves not to flinch when a punch is thrown at their face through repeated conditioning. Instead of instantly regretting the cold, you learn to accept it and not pre-program your reactions to it. Since most people live in 70 degree temps all the time, walking out into sub-freezing weather with minimal clothes is an instant shock to them.
I am just some weirdo that walks around in the cold barefooted and in shorts all year around, and no expert in reprogramming their parasympathetic nervous system or commanding my white blood cells to attack things. The WHM method just allows me to do it longer and in colder weather. YMMV and all that.