I think that because you are graded on effort and not your strength and agility in gym class, it is fair to have it be a part of your GPA. If you are a person who does not care about gym and therefore you will not try, you do not deserve and A and it should be shown on your GPA. In school we work for things, and gym is a part of school. In addition, gym class is about habits, which teach you a healthy lifestyle.