Hyrox Training Using Heart Rate Zones, The 80/20 Programming Rule
Train Hyrox by HR zones to avoid the most common amateur mistake (always-hard, never recover). Here's the weekly zone distribution, key sessions, and 12-week progression.
The single biggest training mistake amateur Hyrox athletes make is always training hard. They show up for every workout intending to “go hard,” accumulate fatigue, and never build a true aerobic base.
The fix: 80% easy (Z1-Z2), 20% hard (Z4-Z5). Skip Z3 most of the time. The Hyrox simulator is your only Z5-heavy session.
This guide covers the weekly structure, the key sessions, and a 12-week zone-based progression.
The 80/20 rule for Hyrox
Polarised training (heavy Z2 + minimal but high-quality Z4-Z5) is well-established for marathon, triathlon, and ultra-endurance. Hyrox follows the same pattern because the race demands sustained threshold work.
| Volume distribution | What you’ll feel |
|---|---|
| 80% Z1-Z2 (easy) | Conversational. Boring. Working. |
| 20% Z4-Z5 (hard) | Race-pace or harder. Always feels meaningful. |
| <5% Z3 (junk) | Avoid most weeks. |
Why “junk Z3”? Z3 (tempo, ~75% HRmax) feels productive but builds neither aerobic base nor true threshold. It’s the no-man’s-land that keeps you tired without growing your engine. Train Z2 or Z4, not the middle.
Weekly Hyrox training structure
A typical 6-day Hyrox-prep week looks like this:
| Day | Session | Zone target |
|---|---|---|
| Mon | Tempo run (5×1 km @ goal pace) | Z4 |
| Tue | Long aerobic run (60-90 min) | Z2 |
| Wed | Strength + station block | Z3-Z4 |
| Thu | Easy run (45 min) | Z2 |
| Fri | Rest or 30-min Z2 cross-training | Z1-Z2 |
| Sat | Hyrox simulator (full or half) | Z4-Z5 |
| Sun | Long run (90-120 min) | Z2 |
Total weekly volume: 50-70 km running + 2-3 strength/station sessions.
Actual zone breakdown: ~80% in Z1-Z2 across the long, easy, and tempo days. The ~20% Z4-Z5 happens on the simulator and tempo days.
The four key Hyrox HR-zone sessions
1. Threshold intervals (Z4)
5-6×1 km at Hyrox-goal pace, 90 seconds rest between. HR should reach 85-90% by km 1 and stay there.
This session builds lactate threshold: the highest HR you can sustain for ~60 minutes. A higher threshold means a higher Hyrox average HR is sustainable, which means a faster race time.
2. Z2 long run (Z2)
90-120 minutes at conversational pace. HR around 70% of max.
Boring, productive. This is the biggest single contributor to your aerobic base, and the most-skipped session for amateur athletes.
3. Hyrox simulator (Z4-Z5)
A full or half Hyrox 4 weeks before race day. HR will move between Z4 and Z5 across stations.
Tells you exactly where your fitness is and what to fix in the final taper.
4. Brick session (Z3-Z4)
1 km run + 25 wall balls + 1 km run + 50 m sled push + 1 km run. HR sustained Z3-Z4 throughout.
The most race-specific session. Trains the run-station-run transition that defines Hyrox.
12-week zone-based progression
| Weeks | Focus | Volume | Zone emphasis |
|---|---|---|---|
| 1-3 | Base | 50 km | 90% Z2, 10% Z4 |
| 4-6 | Threshold | 60 km | 80% Z2, 20% Z4 |
| 7-9 | Specificity | 65 km | 70% Z2, 25% Z4, 5% Z5 |
| 10-11 | Race sharpening | 55 km | 60% Z2, 30% Z4, 10% Z5 |
| 12 | Taper | 30 km | 80% Z2, 20% Z4 |
Total volume bumps in weeks 4-9, then drops dramatically in the taper.
Common HR-training mistakes
- Always Z3. “Comfortably hard” feels productive and isn’t. Either slow down (Z2) or speed up (Z4).
- No Z2 base. Skipping easy runs means your race-day HR can’t sustain Z4 for 70 minutes.
- Too much Z5. More than 1 hard session per week + a simulator = burnout in 4 weeks.
- Ignoring HR drift. If your HR rises 5+ bpm at the same pace over the course of a session, you’re cooked. End it.
- Wrong HRmax. Using 220-age formula puts your “Z2” actually at Z3 because your true HRmax is higher.
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