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It's hard to know. My wife has been running 5 miles a day for 2 years, and her heart rate on the elliptical will stay around 175 the whole time which is near her max (at age 35). I have been doing a recumbant bike for 6 months, and my heart rate will be around 150 max on the elliptical. Some of this is genetic I think, but those rates do sound a bit too high.
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