Calculate 7 training zones based on lactate threshold heart rate. This advanced method is preferred by intermediate and advanced athletes because it is more precise than generic age formulas.
This method calculates zones using lactate threshold heart rate (LTHR), the point where lactate accumulates faster than the body can clear it. It is more precise than age-based methods because it reflects your current fitness.
Average HR from the final 20 minutes of an all-out 30-minute test
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