What must you learn before you can calculate your target heart rate for exercise?

Before one can calculate the target heart rate for an exercise, one must learn to calculate the resting heart rate which is then the answer. This is then the number of heart beats per minute while one is at rest and this would then measure how one's heart muscle is functioning.

Iwould say being around others who are not drug free is the wrong step because your peers are likely to influence any new or past habits

U no