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The math problem to find maximum heart rate is as follows:
Maximum Heart Rate = 220 - age
For a 13-year-old, the maximum heart rate would be:
Maximum Heart Rate = 220 - 13
Maximum Heart Rate = 207 beats per minute
To find the lower range of the target heart rate zone (70% of maximum heart rate), you would calculate:
70% of 207 = 0.7 x 207 = 144.9
The lower range of the target heart rate zone would be approximately 145 beats per minute.
To find the upper range of the target heart rate zone (85% of maximum heart rate), you would calculate:
85% of 207 = 0.85 x 207 = 175.95
The upper range of the target heart rate zone would be approximately 176 beats per minute.