Answer:
Not everyone can become a genius or a star athlete, but they can improve the skills they have and develop new ones.
Step-by-step explanation:
The above sentence is the MOST important to keep in this article. It makes a claim about the ability of everyone and suggests that they can develop more skills. Other sentences in the article sound irrelevant and redundant. Moreover, this sentence is a key sentence, which can be developed further into a meaningful paragraph.