Iowa Students to Wear Heart Rate Monitors Gym just got a little harder.

 -- Students going back to school in Dubuque, Iowa, are going to find it a little harder to slack off in gym.

Public middle and high school students will have to wear heart rate monitors in gym class to make sure they are actually being physically active.

"It will be a large portion of their grade, because we want to grade them on what they're actually doing in our class," Dubuque Schools Athletic and Wellness Director Amy Hawkins told ABC News.

Teachers will use the information collected from the heart rate monitors to write report cards.

"It really takes the opinion out of things," Hawkins said. "You know it's not really 'I think your kid is doing this and this in class.'"