Imho, one of the interesting things with ice baths and other types of practices that have a hormesis component is that while the initial phase requires some degree of willpower and "push" to get started, ultimately to reach the deeper levels of the practice, one generally needs to "surrender" and embrace the discomfort, rather than continually burn willpower to fight through the resistance encountered. There are limits to anyone's willpower, which is ultimately ego-based to a significant degree.
For ice baths, for example, the first 30 seconds is generally the hardest, and requires some "push" to get through, but to get to the three+ minute mark or more, one generally needs to consciously relax a bit - relatively speaking, of course - into the discomfort while part of your mind is screaming at you to get out of the ice bath.
Same thing with intermittent fasting - depending on one's particular physiology, there will come a point during the fasting window when using willpower to fight the desire to eat is counterproductive - to go longer in the practice, if one wishes, generally the most effective way is to embrace and surrender to the sensations of hunger (while still fasting), rather than fighting through them.
To some extent, besides all the potential physiological benefts, these types of disciplines, when practiced over a period of time, also tend to naturally translate to an individual's resiliency and anti-fragility in other areas of life.
Prolly the same with handling drawdowns in the markets while staying solvent ...
