Big movement runs on three things, and only one of them is muscle. There is strength, mostly through the middle of the body, because arms and legs cannot be steady on a trunk that isn’t. There is balance, which comes from the inner ear and from feeling the ground through the feet. And there is motor planning, which is a technical way of saying working out a brand new movement in the right order before your body has ever done it once. That last one is why a kid can be plenty strong and still stop dead at the bottom of a climbing wall.
None of it is fixed at birth, and none of it improves by being avoided. A kid who feels unsteady sits out, and sitting out is exactly how the base stops getting built. That loop is the thing worth breaking. A comprehensive initial evaluation looks at strength, balance, coordination, and how your kid approaches a movement he has never tried, and then we start at whichever layer is actually holding him back rather than the one that shows.