You might be a heart zoner if ...

• ...you wear your heart rate monitor in place of a watch, even with dress clothes.
• ...you know your heart rate within one beat without having to look down at your monitor.
• ...you know all of the models in the complete Polar line of products.
• ...you know how many calories are burned in each Heart Zone.
• ...you can name all of the books that Sally Edwards has written.
• ...your heart rate goes up when you hear someone talk about 220-age.
• ...you can hold your own when talking heart rates to a doctor or physiologist.
• ...your maximum heart rate has not declined with age in the last five years.
• ...you actually know how to program and use the Polar S710.
• ...you know more than five places to put the transmitter strap to get a good signal.
• ...you own more than three heart rate monitors.
• ...you know more than four mathematical formulas that can be used to estimate HRmax.
• ...you can raise or lower your heart rate using breathing techniques.
• ...you can tell when you are dehydrated by looking at your monitor.
• ...total strangers come up to you and ask for advice about heart rate monitors.
• ...you know the 24-hour rule and the 48-hour rule.
• ...you not only know, but follow the 24-hour rule and the 48-hour rule.
• ...you've read everything there is to read on heart rate training, but still want more.
• ...you know the difference between lactate threshold and anaerobic threshold.
• ...you're not afraid to take a day off if your delta heart rate is high.
• ...you can look down at your heart rate number and know exactly what percentage of your HRmax you're at.
• ...you've mastered heart rate mathematics.
• ...you know all of the current controversies in heart rate training.
• ...you've ever contemplating doing your own heart rate training study, but realize you have to work to pay bills!
• ...you know your sport-specific heart rate maximum values.
• ...you know the relationship between VO2max and heart rate.
• ...you can't wait to "review your numbers" after a workout.
• ...you can calculate Heart Zone training points in your head.

I've only had an HRM about a month now, but I am a data maniac with that thing! I can shamelessly admit that 95% of these things ring so unbelieveably true for me. I laughed my ass off when I read these . Thanks to JoeDom.com for this awesome list.