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Pillar 3: Cardio & Engine Building

The HYROX race is built on endurance — but not just distance running.

It’s an engine that blends aerobic control, pacing precision, and recovery under fatigue across 8×1 km runs and eight demanding stations.

This pillar helps you build that engine step by step: from heart-rate control to race pacing, and from SkiErg rhythm to full simulation flow.

You’ll learn how to combine Zone 2 efficiency, threshold progression, and transition training into a complete cardio system for Season 2025/2026.

“You can’t fake endurance. You build it — one kilometre, one breath, one transition at a time.” —

RB100.Fitness

Coach outlining weekly training plan on whiteboard labelled Zone 2, Threshold, Intervals, Brick
Weekly Engine Builder: The HYROX Cardio Template

Weekly Engine Builder: The HYROX Cardio Template

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Split-scene composition showing athlete running on a curved treadmill on one side and outdoors on the other, consistent form and stride
Treadmill vs Outdoor Running for HYROX Prep

Treadmill vs Outdoor Running for HYROX Prep

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Athlete checking sports watch mid-run inside HYROX venue
Heart Rate, Pace or RPE: The Best Way to PACE a HYROX

Heart Rate, Pace or RPE: The Best Way to PACE a HYROX

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Athlete running light and tall, relaxed shoulders, visible breathing rhythm
Breathing, Cadence and Form: Running Economy for HYROX

Breathing, Cadence and Form: Running Economy for HYROX

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Athlete reviewing splits and pacing chart on whiteboard after threshold intervals
Threshold Training for HYROX: Field Tests and Weekly Progression

Threshold Training for HYROX: Field Tests and Weekly Progression

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Athlete stepping from run lane to sled zone mid-transition, purposeful stride
Brick Sessions for HYROX: Run-to-Station and Station-to-Run

Brick Sessions for HYROX: Run-to-Station and Station-to-Run

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Athlete mid-SkiErg pull, full-body engagement with visible lats and hip drive
SkiErg Efficiency for HYROX: Lats, Hips and Rhythm

SkiErg Efficiency for HYROX: Lats, Hips and Rhythm

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Athlete rowing at controlled cadence
Rowing for HYROX: Stroke Rate, Split Targets and Transitions

Rowing for HYROX: Stroke Rate, Split Targets and Transitions

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Athlete on curved treadmill at easy pace, calm breathing visible
Zone 2 for HYROX: Aerobic Base That Doesn’t Steal Speed

Zone 2 for HYROX: Aerobic Base That Doesn’t Steal Speed

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Athlete running past HYROX station lanes mid-race, steady stride and relaxed face
HYROX Running Engine: How to Hold Pace Across 8×1 km

HYROX Running Engine: How to Hold Pace Across 8×1 km

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