A school district in Des Moines, Iowa has joined a nationwide trend by allowing students to opt out of physical education classes
. 32 states now allow kids to waive or substitute gym classes. Paula Kun, a spokeswoman for the National Association for Sport and Physical Education says: "Unfortunately, so many schools are having more and more waivers — particularly at the high school level. The great majority of high school students are required to take physical education only one year out of the four. They get out for religious reasons, for ROTC, for marching band. There's a whole slew of waiver possibilities."