Maybe people should see how much others improved at their extra-curricular activities since they took them. You are not forced to do those (as you are forced to

Maybe people should see how much others improved at their extra-curricular activities since they took them. You are not forced to do those (as you are forced to study for some exams or go to work), you do them because you have fun with them. Then, what you would really be measuring is how determined the person in question is to be better. That's an ability too.