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I use a heartrate monitor, religiously. Yesterday I did the crossramp at the gym (an ellyptical machine of sorts) and the display said I burned 450 calories... the heartrate monitor said I burned 320. Usually they are closer than that (particularly since the machine at the gym reads my heart rate monitor directly). But alas not yesterday. I got the monitor on the advice of the trainers at the gym and of a close friend who raved about it. And I'm a total convert to it. What I like is this: it's calibrated to me and only to me... my age/weight/fitness level in general... on the machine it's a general indication of what people my size/age should be able to do. But I'm apparently a helluva lot fitter than most 40 year-olds weighing 230 pounds or so. The other issue at the gym is that I don't always use the same machine and each of those can give different readouts. I know of one ellyptical machine just in terms of mileage that gives me almost double the distance of the others... just one of those things. Last but not least, I love taking classes and this was the only way to know how I was really doing in them was to have the monitor. At the end of the day, I guess it comes down to that my inner control freak prefers to have the information with me, on me, for just me. LOL
BTW mine is a Polar, the lowest version they have F4. It's plenty for me and I love it. It rocks.
Ellen
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