Okay, I had never heard much about heart rate monitors until I joined this site, and now I'm thinking I probably need to get one. What exactly is a heart rate monitor? How do you wear one? (Most that I've been looking at just look like a watch but say something about a chest belt or something like that). What information does a heart rate monitor provide? Just the heart rate or does it give calories burned also? Is there a specific model that you guys have had success with? And what is the price range for something like this? Please fill me in! It looks like this is a good way to track calories burned, and I want to make sure I am estimating my exercise calories correctly. Thanks!