What to eat before and during a HYROX race
For most people, HYROX race nutrition comes down to three things: a familiar, carb-based meal two to four hours before your wave, a small top-up snack closer to the start, and sips of water in the Roxzone. If your race will run past about an hour, you might also carry a gel. This guide covers the days before, race morning, fuel and fluids during the race (including what the rulebook allows), caffeine and recovery eating.
The numbers come from the ACSM / Academy of Nutrition and Dietetics / Dietitians of Canada joint position statement and the International Society of Sports Nutrition's caffeine position stand. They're ranges, not prescriptions. If you have diabetes, a heart condition, a digestive disorder, high blood pressure, a history of disordered eating, or you take regular medication, check your plan with your doctor or a registered sports dietitian first.
What should I eat before a HYROX race?
Eat a carbohydrate-based meal you already know sits well with you, roughly 2 to 4 hours before your start time. Keep fat and fiber fairly low, include a little protein, and then top up with a small carb snack 30 to 90 minutes before your wave.
The ACSM joint position suggests about 1 to 4 g of carbohydrate per kg of body weight, eaten 1 to 4 hours before exercise lasting longer than an hour. The longer the gap before your start, the bigger the meal can be. For a 70 kg (154 lb) racer, that range works out to about 70 to 280 g of carbohydrate. Most people land somewhere in the middle and eat less when the gap is short.
The days before
You don't need a classic marathon carb-load. The position statement reserves carbohydrate loading (36 to 48 hours of very high carb intake) for more than 90 minutes of sustained exercise. For HYROX, a sensible approach looks like this:
- Two days out: eat normally, with carbohydrate at every meal.
- The day before: keep carbs steady, go easy on very high-fiber, fatty or spicy foods, skip anything new and go light on alcohol.
- Hydrate normally. Pale yellow urine is a reasonable check. No need to force down liters of water.
Race-morning meal ideas
Pick one you've already eaten before a hard session: oats with banana and honey, white toast or a bagel with jam, rice with eggs, low-fiber cereal with milk, or pancakes with syrup.
Mistakes to avoid: a big fry-up, a huge salad, a new "race" product, or skipping breakfast entirely because you're nervous. If nerves kill your appetite, liquid carbs like juice, a smoothie or a sports drink are easier to get down.
How long before a HYROX race should I eat?
Aim to finish your main meal 2 to 4 hours before your wave, then have a small snack 30 to 90 minutes before the start. The Australian Institute of Sport gives a similar general guide: a meal about 3 to 4 hours out, or a lighter snack 1 to 2 hours out. Work out the timing from your actual start time, not from when the doors open.
HYROX waves run all day, so your start time drives everything. Here's how the timing plays out:
| Start time | Main meal | Top-up snack |
|---|---|---|
| Early morning (7–9 am) | Small breakfast 2–2.5 h before, or a bigger dinner the night before | Banana or gel 30–60 min before |
| Late morning (10 am–noon) | Normal breakfast 3–4 h before | Toast, rice cake or bar 60–90 min before |
| Afternoon | Breakfast as usual, then a carb-based lunch 3–4 h before | Small snack 60 min before |
| Evening | Normal meals, last proper meal 3–4 h before | Small snack 60 min before |
A few practical tips:
- Pack your snacks. Venue queues can be long, and the expo may not sell what your stomach likes.
- Eat before the start tunnel. You'll be there about 10 minutes before your wave.
- Running jostles your gut. If you're prone to stomach trouble, leave a longer gap and keep the last snack small.
- Rehearse it in at least one race simulation with your exact meal and timing.
Do I need gels or fuel during HYROX?
It depends on how long you'll be out there. If you'll finish in under about 45 minutes, you don't need fuel during the race. Between roughly 45 and 75 minutes, a small amount of carbohydrate is optional and may help. If you'll race for more than about 75 minutes, a gel or two is usually worth it.
The ACSM position statement breaks carbohydrate during exercise down by duration:
| Race duration | Carbohydrate during the race |
|---|---|
| Under ~45 min | Not needed |
| ~45–75 min | Small amounts, even just a carb mouth rinse |
| ~1–2.5 hours | 30–60 g per hour |
Most gels contain somewhere around 20 to 30 g of carbohydrate (check the label). In practice:
- Under an hour: start well fueled and skip it, or carry one gel as insurance.
- About 60 to 90 minutes: one gel, often taken around halfway, for example after the sled pull or before the rowing.
- Over 90 minutes: one gel roughly every 30 to 40 minutes, which lands you in the 30 to 60 g per hour range.
Take it where you can breathe, such as an easy start to a run or just before a water point, not straight after the burpee broad jumps.
What the rulebook says about fuel
The 26/27 rulebook sets four rules:
- Carry it from the start, in a pocket, waistband or hydration pack (hydration packs are permitted).
- No outside assistance. You can only take drinks or food from the official aid stations. A friend handing you a gel or a bottle over the barrier counts as outside assistance, and that's a time penalty for each infringement (2 minutes in the penalty table).
- Use the bins. Gel wrappers and paper cups go in the bins provided, not on the Roxzone floor or the run course. Littering can cost you 2 minutes each time.
- Aid-station fluids are for drinking only. Pouring water over your head or body to cool down is also a 2-minute penalty.
In Doubles and Relay, each racer carries their own fuel.
How should I hydrate (electrolytes) for HYROX?
Start the race well hydrated, sip water in the Roxzone when you need it, and think about electrolytes if you sweat heavily, race in a hot venue or race longer than about 90 minutes. Most racers don't need to drink large volumes during a HYROX race.
Before the race
The position statement suggests about 5 to 10 mL per kg of body weight in the 2 to 4 hours before exercise, roughly 350 to 700 mL (12 to 24 oz) for a 70 kg racer. That leaves time to pee before you line up. A little sodium, from food or an electrolyte mix, helps you hold on to the fluid.
During the race
The rulebook says water will be available at least once around each pass through the Roxzone, and a sports drink may also be offered.
- Sip, don't chug. A few mouthfuls at some of the water points is usually plenty.
- Drink to thirst, roughly. The goal is to avoid losing more than about 2% of your body weight in sweat. Don't drink so much that you gain weight.
- Don't over-drink. Drinking far more than you sweat can dilute blood sodium (hyponatremia), which is more dangerous than mild dehydration.
- Want electrolytes? Carry them in a soft flask or hydration pack from the start.
Do you need electrolytes?
Sodium is the main electrolyte you lose in sweat, and losses vary a lot between people. Electrolytes are worth considering if you finish sessions with salt crusted on your kit, race in a warm venue, or will race for more than about 90 minutes.
To learn your own sweat rate, weigh yourself before and after a hard hour of training, without clothes, and account for anything you drank. Each 1 kg lost is about 1 liter of sweat. A sports dietitian can help you turn that into a plan.
Should I take caffeine before HYROX?
Caffeine can help if you already tolerate it. The ISSN position stand found that 3 to 6 mg per kg of body weight, usually taken about 60 minutes before exercise, reliably improves performance, and that benefits may start from as little as about 2 mg/kg. For a 70 kg racer, 3 mg/kg is about 210 mg.
Here's how to use it sensibly:
- Only use what you've tested before a hard training session.
- More isn't better. The ISSN notes very high doses (around 9 mg/kg) often cause side effects (jitters, anxiety, a racing heart, gut upset) with no extra benefit.
- Count all your sources. Coffee strength varies a lot; caffeinated gels and chews list their dose on the label.
- Mind late waves. A big dose before an evening start can wreck your sleep.
- Gum, gels and chews work too if you want caffeine closer to the start.
Skip caffeine, or check with your doctor first, if you're pregnant, have a heart rhythm problem or high blood pressure, have anxiety, or take medication that interacts with stimulants. And if you don't usually drink coffee, race day isn't the time to start.
What to eat after HYROX
Within an hour or two of finishing, eat a meal or snack with carbohydrate and protein, and drink to replace your sweat losses.
- Protein: the position statement suggests about 0.25 to 0.3 g per kg of body weight, or roughly 15 to 25 g, after hard exercise. Sports Dietitians Australia gives a similar 15 to 30 g depending on body size. Examples include a protein shake, a large glass of milk, Greek yogurt, eggs, chicken or tofu.
- Carbohydrate: a normal, carb-based meal refills your glycogen stores. Faster refueling (about 1 to 1.2 g/kg per hour for the first 4 hours) only matters if you race again within 8 hours, for example Doubles in the morning and Relay in the afternoon.
- Fluids and salt: if you weighed yourself, drink about 125 to 150% of what you lost over the next few hours (1.25 to 1.5 L for each 1 kg lost). Salty food helps you hold on to it.
- Go easy on alcohol. A celebratory drink is fine, but a lot of alcohol slows rehydration and recovery.
Pack a recovery snack, such as chocolate milk and a sandwich.
FAQ
What should I eat before a HYROX race?
A familiar, carbohydrate-based meal that's low in fat and fiber, such as oats with banana, toast with jam or rice with eggs. General sports-nutrition guidance suggests about 1 to 4 g of carbs per kg of body weight in the 1 to 4 hours before. Add a small carb snack 30 to 90 minutes before your wave, and don't try anything new on race day.
How long before a HYROX race should I eat?
Finish your main meal 2 to 4 hours before your wave, then have a light snack 30 to 90 minutes before. Plan the timing from your start time, not the venue opening time, and bring your own snacks because waves run all day.
Do I need gels or fuel during HYROX?
If you'll finish in under about 45 minutes, no. Between about 45 and 75 minutes, a small amount is optional. Above about 75 minutes, one gel around halfway, or 30 to 60 g of carbs per hour, usually helps. Under the rulebook you must carry your fuel from the start, nobody can hand it to you, and wrappers go in the bins.
Should I take caffeine before HYROX?
If you tolerate it, yes. 3 to 6 mg per kg of body weight about an hour before the start is the range the research supports, and lower doses may also work. Test your dose in training first, and skip it if you have a heart condition, are pregnant or take medication that interacts with stimulants.
How should I hydrate (electrolytes) for HYROX?
Drink about 5 to 10 mL per kg of body weight in the 2 to 4 hours before your start, then sip water at the Roxzone aid stations during the race. Consider electrolytes if you're a salty sweater, race somewhere warm or will be out for more than about 90 minutes. Don't over-drink, and don't pour aid-station water over yourself, because that's a 2-minute penalty.
Next steps
Read your first HYROX race for the full race-day walkthrough, use the HYROX packing list so your fuel actually makes it into your bag, and see HYROX pacing and the Roxzone to plan where you'll drink. Then pick your event on the race calendar.