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T=0.70 (M)
T = Target heart rate
M = Maximum heart rate = 220 - age
For example, Geoff is 21 years old; therefore, Geoff's target heart rate would be figured as follows:
Maximum Heart Rate:
M = 220-age
M = 220 - 21 = 199
Target Heart Rate:
T = 0.70 (M)
T=0.70 (199)
T=139.3 (round down)
T = 139
Figure Your Target Heart Rate:
Step 1: Determine your maximum heart rate.
M = 220 - [your age]
M = 220 -
Step 2: Plug your answer for M into target heart rate formula. Calculate your target heart rate.
T = 0.70 (M)
T = 0.70
)
T
(round number down, if needed]

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Explanation:

First, find your maximum heart rate.

Take 220 and minus your age.

Then, multiply your maximum heart rate by 0.70. The number you get is called your target heart rate.

If your target heart rate is a decimal number, you may need to round it. Rounding down means to make the number smaller than it is. Ignore the decimal and focus on the whole number.

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