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Your maximum heart rate can be estimated using the formula: 220 - age.
For a 12-year-old, the maximum heart rate would be: 220 - 12 = 208 beats per minute.
To calculate the lower range or target heart rate zone, you would use the range of 70-85% of the maximum heart rate.
Lower range (70%): 0.70 x 208 = 145.6 beats per minute
Upper range (85%): 0.85 x 208 = 176.8 beats per minute
Therefore, the lower range or target heart rate zone would be approximately 146 to 177 beats per minute.