Your target heart rate zone is a range between lower and upper heart rate limits expressed as percentages of your maximum heart rate (HRmax) or as beats per minute (bpm). HRmax is the highest number of heartbeats per minute during maximum physical exertion. The wrist unit calculates your HRmax according to your age: Maximum heart rate =
The table below contains target heart rate zones in beats per minute (bpm) estimated by age in
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| Intensities in |
| Body Workout |
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| Keeps U Fit - Own Workout Program | Intensity | ||
Age | HRmax | Light* Intensity | Moderate Intensity | Hard Intensity |
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20 | 200 | ||||
25 | 195 | ||||
30 | 190 | ||||
35 | 185 | ||||
40 | 180 | ||||
45 | 175 | ||||
50 | 170 | ||||
55 | 165 | ||||
60 | 160 | ||||
65 | 155 | ||||
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An average heart rate that stays under the lower limit (55% HRmax) during the body workout tells you that you might have had problems in keeping yourself focused during the workout or you are still rather unfamiliar with strength training. Later on, when you are more experienced in strength training your heart rate may temporarily even exceed the upper limit (90% HRmax). This is due to shortened rest periods between the sets, as well as increased weights.
Having an average heart rate over 55% HRmax during the body workout tells you that in addition to increasing muscular performance, you have also gained cardiovascular and weight management benefits from the body workout.
*Polar target heart rate intensity definition is modified from international exercise science authorities’ recommendations in which Light intensity can reach lower than 60% HRmax.