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"This is the pulse rate that tells you whether you&amp;#039;re exercising hard enough to promote heart fitness. Target heart rate (THR) has always been based on a unisex formula, but now researchers say that works out to be too high for women. The new calculations are in this chart. Why the big range? If you&amp;#039;re a newcomer to exercise (or a return visitor), aim for the lowest part of the zone (50 percent) for the first few weeks. Then you can gradually build up; 85 percent (the top number) is considered the maximum, which you might want to try for after six months.    Age (in years) Target HR Zone (50-85%) in beats per minute   20 94-160   25 92-156   30 90-153   35 88-149   40 85-145   45 83-141   50 81-138   55 79-134   60 77-130   65 74-126   70 72-123   "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.goodhousekeeping.com/health/a18762/target-heart-rate/?src=shelter_footer>