The most useful habit I picked up these last few years is being slightly uncomfortable on purpose, every day, with no audience.
Cold water in the morning, walking when I could drive, skipping the meal when I’m not actually hungry, sitting through a hard conversation instead of leaving the room, reading a book that’s harder than the one I wanted to read. None of this is dramatic, none of it makes a good post, it costs almost nothing, and that’s the entire point.
What it buys you is headroom. The involuntary discomforts arrive without warning, the deadline that slips, the loss, the long night in a hospital corridor, and they ask for a strength you didn’t know you needed. If your nervous system has spent years at a climate-controlled 23 degrees, you haven’t built that strength, and if you’ve practiced, even badly, even inconsistently, you have a little more to draw from than you would have otherwise.
The mistake people make with this idea is dressing it up. They turn it into a regimen, post the regimen, sell the regimen, and the regimen becomes its own comfort: performed difficulty, applauded, optimized, mild. Whatever was useful about the original act is gone by then.
The version I trust is unglamorous and private. You feel the cold and you don’t film it, you do the lift you don’t feel like doing, you let yourself be bored for an hour without reaching for the screen, you sit through the meditation when the meditation is bad, which is most of the time.
The reward, if there is one, is that the world stops feeling so brittle. The day stops feeling like something you have to survive, and small things (a hot meal, a warm room, a friend on the phone) go back to being small pleasures instead of required infrastructure.
There’s nothing mystical about any of it, it’s just the body, asked to do a little of what it was built to do, answering that it remembers how.