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The math problem that would give you your maximum heart rate would be:
Maximum Heart Rate = 220 - age
Maximum Heart Rate = 220 - 13
Maximum Heart Rate = 207 beats per minute
To find your target heart rate zone, you would take 70-85% of your maximum heart rate:
Lower range: 207 * 0.70 = 144.9 beats per minute (rounded to 145 beats per minute)
Upper range: 207 * 0.85 = 175.95 beats per minute (rounded to 176 beats per minute)
So, your target heart rate zone would be between 145 and 176 beats per minute.