I think the point that needs to be stressed is how a slight innate ability, can at a very early stage in development lead to reinforcement of that ability.
Example if your right hand seems to work better than your left for some things, like supporting your weight while you swat at a string with the other paw, you will tend to swat that way more often, and get better at it. A left batter spends twice as much time hitting left and improving that swing than a switch hitter. A baby young child that excels at physical tasks gets reinforced to do more physical tasks and develops these physical skills. It's a positive feedback cycle.
Like any feedback system, negative feedback can slow it down, given sufficient discouragement and the wrong instruction, development can be delayed. Given good instruction and encouragement development can be enhanced. Indeed, it seems to me that there are folks with hidden latent ability that has been suppressed, and is only waiting for the correct encouragement to rekindle the positive feedback system. I've seen people thought to be hopeless uncoordinated klutzes in their LATE TEENS develop into acknowledged "physically intelligent" athletes.