Training
Zone 4 Training
R
Repz
Threshold heart rate zone (80-90% max HR) where lactate accumulates faster than the body can clear it - used for interval training and HYROX® station bursts.
Zone 4 Training — Threshold heart rate zone (80–90% max HR) where lactate accumulates faster than the body can clear it—used for interval training and HYROX® station bursts.
Definition and limits
Zone 4 is a label used by some heart-rate systems for a high-intensity range. Its numeric boundaries depend on the zone model and on how maximum or threshold heart rate was estimated. It is not a universal physiological compartment, and pace, power, perceived exertion and the talk test can provide complementary context.
FAQ
What does the term mean?
The definition is explained above.
Is there one universal target?
No. Context and the individual matter.
Does it guarantee HYROX® performance?
No.
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