^^^Does that not answer a question which hasn't been asked? That is "how should you practice for optimal development" as opposed to the original contention that "Practicing your strengths is more important than working on your flaws"?
On a side not, was Vygotski's ZPD theory based on cognitive development in children?
Do you expect me to run forward and get it in one bounce when I am hitting? - Sureshs 2014