Answer:
When she is resting
Step-by-step explanation:
It is very important that the target heart rate of an individual is calculated, if that individual will start exercising. This importance is observed because through the target heart rate, it is possible to discover the heart rate, the heart and lungs of that individual will benefit from the exercise practiced.
The best way to calculate the target heart rate is when the individual is resting. At that point, he should take your pulse for 10 seconds and then multiply the result by 6. This way he will know your heart rate per minute.