HYROX in Australia has one variable that changes the fuelling maths compared with an outdoor endurance race: indoor venues. Crowded halls hold heat and humidity, air movement is poor, and the sweat losses athletes report are consistently higher than the same effort outdoors would produce.
The second variable is the wait. Heat times shift, and athletes often sit around for hours after their planned breakfast. A fuelling plan that assumes you eat and start 90 minutes later falls apart when your heat runs late, so build a plan with a top-up in it.
What the race demands
Format
8 x 1km runs with 8 functional stations
Venue
Indoor, typically warm and humid with poor airflow
Main risk
Heat times slipping and leaving your fuelling window stale
Second risk
Sodium losses higher than an outdoor session at similar effort
Carbohydrate and sodium targets
- Sub-70 minutes: pre-load and sip. A full in-race fuelling plan is rarely needed
- 70 to 90 minutes: 30 to 60g of carbohydrate per hour
- 90 minutes and beyond, including doubles and relays: 40 to 60g of carbohydrate per hour
- Sodium: 500 to 1,000mg per hour in a hot indoor venue if your sweat rate is high
HYDRAX CORE delivers 85g of dual-carb fuel and 980mg of sodium per serve, so hitting the numbers above is arithmetic rather than guesswork. HYDRAX PRIMER covers the pre-race window with 29g of carbohydrate and 1,313mg of sodium. Run the free fuelling strategy tool to convert these ranges into your own per-hour numbers.
Rehearse the plan in training, then race it. Order now, ships Australia-wide.
Race week and race day timeline
Day before
Higher carbohydrate, lower fibre. You want a settled gut for a high-impact race format.
3 hours before your heat
Familiar carbohydrate meal, 1 to 2g per kg. Keep fat and fibre low.
If your heat is delayed
Top up with a small carbohydrate drink rather than sitting on an empty tank for an extra hour.
25 to 40 minutes out
One serve of PRIMER for carbohydrate and 1,313mg of sodium before the first run.
In race
Sip CORE at the stations that allow it. Small volumes, never a full bottle in one go.
Frequently asked questions
How should I fuel a HYROX race in Australia?
Eat a familiar low-fibre carbohydrate meal around 3 hours before your heat, take a pre-race serve 25 to 40 minutes out, and plan 30 to 60g of carbohydrate per hour in race if you expect to finish beyond 70 minutes. Indoor Australian venues are usually warm and humid, so plan sodium generously.
Do indoor venues change hydration needs?
Yes. Indoor halls trap heat and humidity with little airflow, so sweat evaporates poorly and losses run higher than the same effort outdoors. Many athletes need 500 to 1,000mg of sodium per hour in those conditions.
What if my HYROX heat is delayed?
Do not simply wait it out. Take a small carbohydrate drink to hold your fuel status, then re-time your pre-race serve to 25 to 40 minutes before the revised start.
Do I need to fuel during a sub-70 minute HYROX?
Generally no full in-race plan is required. Pre-loading carbohydrate and sodium before the start plus small sips is usually enough at that duration. Longer finishes, doubles and relays are a different problem.
Keep reading
- Complete HYROX nutrition guide
- HYROX fuelling by finish time
- Best electrolyte for HYROX
- Carb loading for HYROX
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.