9 |
Corresponds to "very light" exercise. For a healthy person, it is like walking slowly at his or her own pace for some minutes
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13 |
On the scale is "somewhat hard" exercise, but it still feels OK to continue.
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17 |
"Very hard" is very strenuous. A healthy person can still go on, but he or she really has to push him/herself. It feels very heavy, and the person is very tired.
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19 |
On the scale is an extremely strenuous exercise level. For most people this is the most strenuous exercise they have ever experienced.
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