Out & Back:
1/2 - 3/4 of Lydiard Effort Chart
* Yellow highlight = the best suggested target RPE
| RPE | Intensity | Breathing | Talking | % VO2 Max |
|---|---|---|---|---|
| 4 | Somewhat strong | Noticeable | Somewhat easy | 65 |
| 5 | Strong | Deep, but steady | Challenging but in control | 75 |
| 6 | Between strong & very strong | Deep and somewhat rapid | Difficult | 85 |
| 7 | Strong – very strong | Deep & rapid | Very difficult | 90 |