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Your maximum heart rate depends considerably on the activity. I haven't done crossfit before, but certainly you're involving more muscle groups than running. Biking and running have different HR zones because of weight-bearing vs. sitting. I suspect your HR zones for Crossfit and running are simply different. It sounds like you're working hard with both ...


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A similar question was asked of Cecil Adams in his Straight Dope column about the differences in heart rate between exercising and caffeine. I think that the central takeaway is similar in both cases. Cardio exercise is not about raising the heart rate — that's just a handy metric for measuring relative effort — but about exercising all of the systems of the ...


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Eliminate the work of storming around the room. Yes the heart is a muscle and working that muscle works that muscle. It is a very important muscle but it is a relatively small efficient muscle. The heart alone does not consume a lot of calories. If you are working legs and the legs ask for fuel and oxygen and that causes the heart to beat faster that is ...



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