Heart Rate 215?:???

You don't say how you're measuring your HR. Ir you're using an HRM then my 2 cents worth are that tools like these are pretty unreliable. You're better off being able to learn how to measure your heart rate during exercises from you GP or an RN. In any case your HR shouldn't get that high unless you're an extraordinary person.

Now, if you're HR had really gotten that high and you're not in what you would call good physical condition I would try to document in as much detail as possible your activities prior to that reading, during that reading and immediately after and then go see your doctor and explain it to him.

I wouldnt worry, I would imagine there was something wrong with the HRM.

When determining your HR percentage you start with 220 and deduct your age. That is the highest your HR should ever go. At least this is what I have read.

So me at 100% is 173. Cardio zone is 90% and fat burning zone is 121-137.

I almost passed out when mine was 170 ( the first time I tried to jog!)

So I really cant imagine your HR was 215 and you were still standing!!

Since we are on the topic...has anyone keep their HR in the fat burn zone and lost more weight then the Cardio zone?

now that is a good question. in this heat I am having a heck of a time keeping under 137 BPM. It is 140-160 if I am walking backwards!

I wanna burn da fat, ya know what I mean.

Did you take any medications that day? Sometimes decongestants like Sudafed and Sudafed PE can raise your HR and BP. I have actually gone as high as 220 myself under those circumstances. I wouldn't worry overmuch about the actual number, pay attention to how you feel though. If you start to feel lightheaded and dizzy, slow down and take it easy - that's the way I've always done it and it works for me, anyway. I would think that you'd be in more danger of simply passing out than actually suffering any kind of major coronary event though, so don't panic!