220 - your age = A#
A# - your resting heart rate* = B#
B# x .65 = C#
C# + your resting heart rate = your low end of you target heart rate
B# x .80 = D#
D# + your resting heart rate = your high end of you target heart rate
*see the "Find your pulse" post
As you do you cardio workouts try to maintain your heart rate between you Low and High number for at least 30 minutes most days of the week.
An example:
A 26 year old with a resting heart rate of 67
220 - 26 = 194
194 - 67 = 127
127 x .65 = 83
83 + 67 = 150
127 x .80 = 102
102 + 67 = 168
So the target exercising hear rate zone is 150-168 bpm
(If you are very de-conditioned you may need to times is by .55 & .75)
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