In a recent study, researchers discovered that high school students who participated in after-school sports had higher GPA scores compared to those who did not participate in any sports. Based on this finding, the school's principal proposed that all students should be required to participate in after-school sports in order to improve overall academic performance.

This argument seems reasonable at first glance; however, it contains several assumptions that need to be examined. Write a critique of the argument, discussing its strengths and weaknesses and suggesting improvements or additional evidence that would strengthen its validity.