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Answer:
Subtract your heart's resting rate from your maximum rate. For example, if you are 40 years old, subtract that number from 220; your maximum rate is 180. Next, subtract your resting rate or 80 in this example. Your heart-rate reserve is 100 beats per minute.
I believe this is true. However, too much strain on the muscle will cause it to become damaged, so always put strain on your muscles in moderation.
The answer is D hope it helps!!
