HYROX is the most demanding hybrid race format in the world. It tests your aerobic engine, your muscular endurance, your strength, and your mental fortitude, all within a single event. Most athletes train for it meticulously. Most athletes fuel for it like an afterthought.
HYDRAX was built for HYROX. Dual-carbohydrate energy, high-sodium electrolytes, and isotonic absorption, designed for an event that asks everything of you in an indoor environment where sweat rate is high and the stakes at each station are real.
The hybrid event problem
HYROX is not a marathon. It is not a CrossFit competition. It is a race that cycles you through aerobic running and anaerobic, neuromuscular station efforts, back and forth, eight times, with almost no recovery between them.
This hybrid demand depletes muscle glycogen faster than a pure endurance event of equivalent duration. Research on high-intensity intermittent exercise shows glycogen utilisation can be 2 to 3 times higher per unit time compared to steady-state running (Hargreaves et al., 2020). An athlete finishing in 80 minutes can be working from meaningfully depleted glycogen reserves by the final stations: the sled pull, the sandbag lunges, the wall balls, where it hurts the most to run low.
HYROX is also an indoor event. Venues run warmer than outdoor racing. Sweat rates during HYROX are typically 0.8 to 1.5 litres per hour, higher than most athletes expect, and sodium losses are substantial.
The HYDRAX system for HYROX
HYDRAX PRIMER — before the race
One serve in 400 to 500ml water, 25 to 40 minutes before the gun. Delivers 29g of dual-carb fuel and 1,313mg of sodium, expanding plasma volume and topping up blood glucose before the race clock starts. Every hard HYROX effort begins from a better baseline with HYDRAX PRIMER in the system.
HYDRAX CORE — during the race
A 500 to 750ml bottle of HYDRAX CORE, sipped at transition points from the 40 to 45 minute mark. The 2:1 maltodextrin-fructose ratio uses two intestinal transport pathways simultaneously (SGLT1 and GLUT5), delivering carbohydrates to working muscles at up to 90g per hour. High-sodium electrolytes replace what the indoor venue takes from you.
Your strategy by finish time
| Finish Time | Pre-Race | During Race | Post-Race |
|---|---|---|---|
| Under 60 min | 1 serve PRIMER in 400ml | Not required | CORE in 500ml |
| 60 to 90 min | 1 serve PRIMER in 500ml | 500ml CORE, sip from 45 min | CORE + protein meal |
| 90-plus min | 1 serve PRIMER in 500ml | 750ml CORE, from 40 min | CORE + protein meal within 60 min |
Read the full HYROX fueling guide by finish time →
HYDRAX CORE and HYDRAX PRIMER — Order now, ships Australia-wide.
What each station costs you
Understanding the demand helps you understand why the right fuel matters in the back half.
SkiErg (1,000m): Upper body aerobic output. Moderate glycogen demand, high cardiovascular load.
Sled Push (50m): Maximal lower body force. Acute local glycogen depletion in quads and glutes.
Sled Pull (50m): High hip and back demand. Neuromuscular precision required; impaired by electrolyte depletion.
Burpee Broad Jumps (80m): Explosive, repeated. One of the highest glycogen cost-per-metre stations.
Rowing (1,000m): Sustained aerobic effort. Glycogen and electrolyte demand mirrors steady-state running.
Farmers Carry (200m): Grip strength and stability under load. Muscular fatigue compounds existing systemic fatigue.
Sandbag Lunges (100m): Late-race. Maximum glycogen demand at the point where reserves are lowest.
Wall Balls (100 reps): Final station. Repeated explosive effort requiring both power and endurance.
The pattern: glycogen demand is front-loaded through high-power stations; electrolyte depletion compounds gradually; the hardest stations come when both reserves are at their lowest. HYDRAX addresses both.
Why HYDRAX works for HYROX
| Feature | Why it matters for HYROX |
|---|---|
| PRIMER: 1,313mg sodium pre-race | Expands plasma volume before the first station; reduces mid-race cramping risk |
| CORE: Dual-carb (2:1 maltodextrin:fructose) | Up to 90g carb absorption per hour; sustains power output across back-half stations |
| CORE: High-sodium electrolytes | Replaces indoor sweat sodium losses; protects neuromuscular function at wall balls and lunges |
| CORE: Isotonic formulation | Fast gastric emptying during high-intensity efforts between stations |
| Both: Stimulant-free | Stack caffeine at your preferred dose and timing without overlap |
| Both: Modular | Adjust concentration for pre-race, in-race, and post-race use |
HYROX Nutrition Resources
- The Complete HYROX Nutrition Guide
- HYROX Fueling by Finish Time
- Best Electrolyte Drink for HYROX
- Carbohydrate Loading for HYROX
- HYROX Australia Fuelling Guide
HYROX sits in an awkward middle ground: too short to fuel like a marathon, too long and too hot to fuel like a gym session. Start with the physiology, then personalise it. Read how much sodium you actually need, understand why osmolality matters for performance, and check the high-carbohydrate fueling strategy if you are chasing a sub-70 finish.
To convert that into litres and grams, calculate your sweat rate here and run it through the Fuelling Strategy Engine. Athletes cross-training into longer events can compare protocols in our marathon fuelling plan, Ironman 70.3 nutrition plan and page on endurance fuel for runners.
For the training block itself, HYDRAX CREATINE supports the repeat-effort work HYROX is built on, and single-serve sachets make race-morning dosing simple. You can build your kit here.
HYDRAX CORE and HYDRAX PRIMER — Order now, ships Australia-wide.
Frequently Asked Questions
Do I need to fuel during HYROX?
It depends on your finish time. Under 60 minutes, pre-loading with PRIMER is sufficient. For 60-plus minute athletes, having HYDRAX CORE available to sip at transition points is beneficial. For 90-plus minute athletes, active in-race fueling is non-negotiable.
Where do I carry HYDRAX CORE during the race?
A soft flask on a race belt or a small bottle staged at a personal gear spot (check venue-specific rules). The key is to have it accessible at transition points between stations and run segments.
Can HYDRAX help prevent cramping at HYROX?
Cramping in HYROX has multiple causes: inadequate preparation, neuromuscular fatigue, and electrolyte depletion. HYDRAX PRIMER addresses the pre-race sodium window and HYDRAX CORE addresses in-race electrolyte replacement, reducing electrolyte-driven cramping risk over 90-plus minutes.
I finish HYROX in about 75 minutes. Should I carry fuel?
Yes. At 75 minutes, the final 2 to 3 stations coincide with meaningful glycogen depletion. A small soft flask with half a serving of HYDRAX CORE, with a few sips from the 45-minute mark, provides a late-race energy top-up that can make a tangible difference in wall ball power output.
Is HYDRAX available in Australia?
Yes. HYDRAX CORE and HYDRAX PRIMER are available now and ship Australia-wide.
Eight stations. Every one counts. Fuel accordingly.
Disclaimer: This page is general information for healthy adult athletes and is not medical, dietetic or coaching advice. Individual carbohydrate, fluid and sodium requirements vary with body weight, sweat rate, conditions and health status. Speak with your doctor, sports physician or an accredited sports dietitian before changing your nutrition or supplement routine, rehearse any fuelling plan in training before race day, and always follow the directions and warnings on the product label.