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Originally posted by Did you just call me Coltrane?
My opinion, as always, is that these things are useless, as are personal trainers. However, many people seem to find them useful. Depending on what one is trying to accomplish, I think HRMs can limit people. The human body is much more capable of adapting and can take much more physical stress than most people think it can. Our limits go well beyond what our personal trainers and HRMs tell us.
Of course, if you're just using these things as a method for staying/getting in shape, then they probably serve a practical purpose. Hence, they're probably practical for most people, which makes my opinion practically irrelevant.
Personal trainers are like headhunters -- I can't find any real reason why they should exist.
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I have a tendency to shirk and try to fool myself that I'm not shirking. If I know what pace I'm at on non-shirky days, being able to see that I'm not even coming close to duplicating it tends to motivate me on shirky days.
I don't use a heart rate thing, though; I tend to use the "calories per minute" meter. I think it's totally inaccurate, but it measures in small enough units that I can track it.
If I had a heart rate monitor, I would probably use it for the same purpose -- to remind myself to keep above a certain level.