Heart Rate Monitors in Physical Education

Some school systems are going away from the traditional gym class grading that consist of dressing out and participation and are now incorporating the use of heart rate monitors.  Student grades are dependent upon maintaining a heart rate within their target heart range for an extended amount of time.  I would love to incorporate this technology into our school as I feel this way of grading helps to emphasize the true purpose of physical education which is physical activity and not just dressing out and being cooperative.  In my experience, students understand that to get an "A" in physical education class they just have to dress out and minimally participate in the days activities.  This does nothing to motivate students to truly exercise and work up a sweat.  Grading that is dependent upon a students heart rate monitor's readings motivates students to do more than just the minimum and will in turn produce more physically fit students.