It shoes how many times a minute a person's heart beats. A normal heart rate is particular to each individual, depending on several factors, such as: age, body size, exercise, heart disease or medication.
Emotions or stress can also have an impact on the heart rate (it increases when the heart is subjected to stressors).

It is important to know how we can measure our heart rate while resting and what are its normal values.
There are several areas of the body where the heart rate can be measured, namely: the wrists, on one side of the neck, the groin area and the upper part of the foot.
For a correct estimate, place a finger on one of these areas and count the number of beats in 60 seconds. It is important to stand still for 10 minutes before measuring the heart rate.
Thus, for adults who are over 18 years old, the heart rate while resting is between 60 and 100 beats per minute, this depending on the physical condition of that person. Athletes and those with an excellent physical condition can have a heart rate of 40 beats per minute.

The maximum heart rate is defined as the highest number of beats per minute that the heart can pump under maximum stress.
The most accurate way to determine the maximum heart rate is to perform an effort test. More specifically, the tested person is subjected to controlled physiological stress, such as running on a treadmill while being monitored using an EKG (electrocardiography). Thus, the intensity of the effort will be increased gradually until certain changes in heart function are detected on the EKG monitor, at which point the effort test will stop.
The duration of the effort test varies between 10-20 minutes.

However, various formulas exist and are used to calculate the maximum heart rate, determined by studies and meta-analyses, but the most commonly used formula is:

To train more efficiently. In the case of a training based on heart rate (cardio training), knowing the maximum heart rate allows training at the right intensity to achieve the proposed goals. Basically, a heart rate-based workout is better/smarter than a hard workout.

At least 15-20 minutes of training, ideally 35-45 minutes.
For beginners, training should start at a heart rate of 60-70% of the maximum heart rate, the intensity being increased along the way.

It is possible to exceed the upper limit of the maximum heart rate if there is no coronary artery disease or a possible risk of heart attack, the consequences being, however, injuries or pain in the muscles or joints.

The heart rate that burns the most adipose tissue is 70 -80% of the maximum heart rate, maintained for at least 20 minutes.

In the case of a person who does not do performance sports, the heart rate requires a visit to the physician when it is constantly higher than 100 beats/minute or under 60 beats/minute.

Sedentary people, should work at about 57% - 67% of the maximum heart rate.
People with minimal activity, should work at 64% - 74% of the maximum heart rate.
People with sporadic physical activity, should work at 74% - 84% of the maximum heart rate.
People who exercise regularly, should work at 80% - 91% of the maximum heart rate.
People with constant physical activity at high intensities, should work at 84% - 94% of the maximum heart rate.