The reason that most people don’t possess extraordinary physical capabilities isn’t because they don’t have the capacity for them, but rather because they’re content to live in the comfortable rut of homeostasis and never do the work that is required to get out of it.
The traditional approach to learning is not designed to challenge this: It assumes that learning is all about fulfilling your innate, fixed potential and that you can develop a particular skill or ability without getting too far out of your comfort zone.