Heart beat it up!

When i was doing my observations, there was a class called fitness for life which is somewhat a combination of a health class and a physical education class. Some days they are in the gym plaaying games that gets there heart rate going, and other days they are in the class room. I noticed that all of the students in his class were wearing heart rate monitors. The students were taught how to use them and they record their heart rates at given times throughout the class when they are participating in physical activity. They try and reach their target heart rate and aintain it throughout the duration of the class time. i feel that this technique/strategy for measureing a students fitness level and active participation is something that would work in any physical education class and is something that i definately want to try and incorporate into one of my classes.