(press a digit on the left side)
6 | No exertion at all | No muscle fatigue, breathlessness or difficulty in breathing. |
7 | Extremely light | Very, very light. |
8 | ||
9 | Very light | Like walking slowly for a short while. Very easy to talk. |
10 | ||
11 | Light | Like a light exercise at your own pace. |
12 | Moderate | |
13 | Somewhat hard | Fairly strenuous and breathless. Not so easy to talk. |
14 | ||
15 | Hard | Heavy and strenuous. An upper limit for fitness training, as when running or walking fast. |
16 | ||
17 | Very hard | Very strenuous. You are very tired and breathless. Very difficult to talk. |
18 | ||
19 | Extremely hard | The most strenuous effort you have ever experienced. |
20 | Maximal exertion | Maximal heaviness. |