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| Intensity | %VO2 reserve/% HR reserve | % HRmax | Perceived exertion scale (RPE) 6 to 20 |
| Very light | < 37 | < 57 | RPE < 9 |
| Light | 37 to 45 | 57 to 63 | RPE 9 (very light) to 11 (fairly light) |
| Moderate | 46 to 63 | 64 to 76 | RPE 12 (fairly light) to 13 (somewhat hard) |
| Vigorous | 64 to 90 | 77 to 95 | RRE 14 (somewhat hard to 17 (very hard) |
| Near maximal to maximal | ≥ 91 | ≥ 96 | RPE ≥ 18 (very hard) |
HR: heart rate; RPE: rating of perceived exertion; VO2: oxygen consumption
