The most useful habit I picked up these last few years is being slightly uncomfortable on purpose, every day, with nobody watching.
Cold water in the morning, walking when I could drive, skipping the meal when I’m not actually hungry, staying in a hard conversation instead of leaving the room, reading a book that’s harder than the one I wanted to read. None of it is dramatic and none of it makes a good post. It costs almost nothing, and that is the point.
What it buys you is headroom. The discomforts you didn’t choose 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 body has spent years at a climate-controlled 23 degrees, you don’t have it. If you’ve practiced, badly and on and off, you have a little more of it than you would have had.
The mistake people make with this is dressing it up. They turn it into a regimen, post the regimen, sell the regimen, and by then the regimen is its own comfort. The difficulty is performed, somebody claps, and whatever was useful about the original act is gone.
The version I trust is 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, and 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 being something you have to survive, and a hot meal or a warm room or a friend on the phone goes back to being a small pleasure instead of something you needed to get through it.
There’s nothing mystical about any of it. The body was built to do a little of this, and it remembers how.