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Rating of Perceived Exertion - RPE                       2022-04-12
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Ideally you would measure exercise intensity by monitoring your
heart rate. However, not everyone has a heart rate monitor readily
available. You could measure it by stopping and taking your pulse
at regular intervals...But, there is an alternative that works
remarkably well: the Rating of Perceived Exertion, or RPE, also
known as the Borg scale.

A Rating of Perceived Exertion is perhaps the most basic way to
express the intensity you are experiencing during an exercise, and
yet for all its simplicity, it has great value.

+--------------------------+----------------------------------+
| Level  | Description     | Breating                         |
+--------------------------+----------------------------------+
| RPE 1  | extremely easy  | restful breathing, can sing      |
| RPE 2  | very easy       | can talk in complete sentences   |
| RPE 3  | easy            | can talk in broken sentences     |
| RPE 4  | moderate        | talking first becomes difficult  |
| RPE 5  | somewhat hard   | heavy breathing begins           |
| RPE 6  | moderately hard | deep breaths, talking is avoided |
| RPE 7  | hard            | deep and forceful breathing      |
| RPE 8  | very hard       | labored breathing, can't talk    |
| RPE 9  | very, very hard | very labored breathing           |
| RPE 10 | extremely hard  | gasping for air                  |
+--------------------------+----------------------------------+