GoKawiilIt recently became apparent to me (although, sadly, not for the first time), that my stability is lacking. The cause is my foot. It's underdeveloped. I'm working on it. But it has improved significantly in the last year or so. My mental model of a normal person's foot has crystalized into a point -> line -> surface continuation.
Most people who don't actively use their feet, and ideally walk/exercise barefoot (or similar) end up losing the raw capacity of the foot as a surface upon which they stand. Which, originally, it is. The foot is a surface. That might seem obvious, but with long enough lack of use, that surface atrophies into a line, between the heel and the ball of the big toe. A line is less stable than a surface, and the individual loses stability, and capacity in movement. Still more underuse and it atrophies from a line to a point. We don't think of underdeveloped feet as points, but in terms of the amount of stability they provide they akin to walking on stilts... Standing on the foot instead of with or through the foot.