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Enter Lactate Threshold Heart Rate (LTHR) :

Zone Heart Rate RPE Description
1   1-2 Recovery
2   3-4 Endurance
3   5-6 Tempo
4   7 Lactate Threshold
5a   8 Above Threshold
5b   9 Aerobic Capacity
5c   10 Anaerobic Capacity

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Used with permission by Joe Friel, author Mountain Bike Training Bible.
Zone Calculator by Curt Wilhelm,