RPE Scale for Hyrox: Rate Your Training Intensity

RPE is a subjective scale

Heart-rate zones divide a continuous response into categories. Three-zone and five-zone systems use different boundaries, so “Zone 2” or “Zone 4” is incomplete without naming the model. Individual physiological thresholds do not always align with fixed percentages.

Jamnick et al. training-zone methods review

Estimate with caution

Age-based maximum-heart-rate formulas are population estimates, not exact personal maxima. A measured peak from an appropriate test may still be affected by protocol, motivation and device accuracy. Heart-rate reserve also depends on a reliable resting value. Do not present one calculation as precise.

Jamnick et al. training-zone methods review

Use more than heart rate

Combine heart rate with perceived effort, talk test, pace or power and session purpose. Heat, dehydration, altitude, stress, caffeine, medication, fatigue and cardiac drift can change heart rate at the same workload. Wrist sensors can lag or lose accuracy during rapid changes and gripping.

Jamnick et al. training-zone methods review · Talk test validation study

Apply zones to training

Easy work should feel manageable under the selected model; threshold and interval work require different controls. Weekly distribution depends on history, total load and goal. No universal 80/20 split, number of zone sessions or percentage table has been validated specifically for every HYROX^® athlete.

Jamnick et al. training-zone methods review

Race heart rate is descriptive

Heart rate during a race reflects running, stations, heat, excitement and accumulated fatigue. The small simulated HYROX^® study describes one sample and cannot establish a universal race zone or target bpm. Use race data retrospectively with pace, splits and symptoms rather than chasing a ceiling.

HYROX^® acute physiology study

Safety and reassessment

Reassess settings when fitness, medication, device or conditions change. Stop for chest pain, faintness, unusual severe breathlessness or palpitations with loss of control and seek appropriate care. A zone target should never override symptoms or safe technique.

ACSM exercise screening statement

Frequently asked questions

Which zone model should I use?

Use one model consistently and understand how its boundaries were estimated.

Jamnick et al. training-zone methods review · HYROX^® acute physiology study

Is 220 minus age my exact maximum?

No. It is a population estimate with substantial individual error.

Jamnick et al. training-zone methods review · HYROX^® acute physiology study

What zone should I race in?

There is no universal HYROX^® zone; effort varies across runs, stations and athletes.

Jamnick et al. training-zone methods review · HYROX^® acute physiology study

Why does heart rate rise at the same pace?

Heat, dehydration, fatigue and cardiovascular drift can raise it without a pace change.

Jamnick et al. training-zone methods review · HYROX^® acute physiology study