The main purpose of physical education classes in schools is to make students physically fit. Physical education classes should focus on aerobic exercises, which can promote the health of participants more than group sports, and in fact only a small number of students participate in group sports. If the above views are correct, the author will most effectively oppose one of the following:. ['Physical training programs used in schools to encourage healthy habits for life.', 'Young students should participate in community sports teams.', 'School relies too much on aerobic exercise programs to help all children become healthy.', 'Most school physical education classes are used for group sports.']