This HYROX nutrition guide gives you two things at once: how to fuel every training week, and exactly what to eat in the 72 hours before race day. The numbers that matter: eat 5-8 g of carbs per kg of bodyweight on hard training days, carb-load to 7-10 g/kg per day for the final 48-72 hours, have a 1-4 g/kg carb breakfast 1-4 hours before the gun, and take in 30-60 g of carbs per hour during a race that runs 60-90+ minutes. Get those ranges right and you protect the one thing that decides most HYROX times after fitness: not blowing up. This is the pillar hub for the whole nutrition cluster — start here, then drill into carb-loading, the race-morning meal, and in-race fueling below.
HYROX Nutrition Guide: The Race-Week Timeline
The core of any HYROX nutrition guide is the race-week timeline, because the final 72 hours are where good training is either cashed in or wasted. The plan is simple: progressively fill your glycogen stores while your training volume drops, keep the food familiar and low-fibre as you get closer, and lock in hydration and sodium. Here is the hour-by-hour blueprint, with real numbers per kg of bodyweight.
| Timeframe | Carbs | Focus | Watch out for |
|---|---|---|---|
| 72h out (T-3 days) | 7-8 g/kg/day | Start the carb-load; rice, pasta, potatoes, oats, fruit. Training is light. | Don't add fat/fibre calories on top — swap, don't stack. |
| 48h out (T-2 days) | 8-10 g/kg/day | Peak load day; lean toward lower-fibre carbs. Keep protein at 1.6-2.0 g/kg. | Some water-weight gain (1-2 kg) is normal and means it's working. |
| 24h out (T-1 day) | 7-8 g/kg/day | Maintain load, cut fibre hard, hydrate steadily, add sodium to fluids. | Avoid new restaurants, spicy food, and alcohol. |
| Race morning (T-1 to 4h) | 1-4 g/kg | Familiar carb breakfast: oats, banana, white bread, honey, sports drink. | Nothing new. Finish eating with time to digest. |
| In-race (60-90+ min) | 30-60 g/hour | Gels, chews, or drink; sip 400-800 ml fluid/hour with sodium. | Only use products you've tested in training. |
Notice the shape: carbs climb into the race, fibre falls, and hydration is constant. Everything in this HYROX nutrition guide below just expands the rows of this table — but if you only remember one thing, remember that nothing on race day should be new.
Daily HYROX Nutrition in a Training Block
Day-to-day HYROX nutrition is what makes race week even work — you can't top off a tank you keep running empty. Because HYROX training is genuinely hybrid (running plus strength-endurance stations), your fuel demands sit higher than a pure lifter's and your protein needs sit higher than a pure runner's. Three levers carry almost all the result:
- Carbohydrate — 5-8 g/kg/day: Scale it to the session. An easy day sits near 4-5 g/kg; a hard interval-plus-sled day pushes 7-8 g/kg. Carbs are the fuel your runs and high-rep stations actually burn.
- Protein — 1.6-2.2 g/kg/day: Split across 3-4 meals of roughly 0.4 g/kg each. This protects muscle against the muscle-eroding side of high-volume endurance work and drives recovery from lifting.
- Fat — the remainder, ~0.8-1.2 g/kg: Fill the rest of your calories here for hormones and satiety, but keep it lower around hard sessions so it doesn't crowd out carbs or slow digestion.
Hydration is the quiet fourth lever: drink to thirst across the day and check that your urine is pale straw, not dark. Chronic mild dehydration quietly tanks running economy and station output long before race week. If you're deciding how to sequence those sessions, the run-or-lift-first question interacts with fuelling — heavier sessions deserve fuller glycogen.
HYROX Carb-Loading: 48-72 Hours Out (7-10 g/kg)
Carb-loading is the single highest-leverage move in this HYROX nutrition guide, because a HYROX race lasts long enough (typically 60-90+ minutes at high intensity) to genuinely deplete muscle glycogen. The modern protocol is not the old week-long depletion-then-load ordeal — it's a simple 2-3 day front-load while you taper.
- Target 7-10 g/kg/day of carbohydrate across the final 48-72 hours. For an 80 kg athlete that's roughly 560-800 g of carbs per day.
- Swap, don't stack: Hit the number by replacing fat and fibre with carbs, not by eating your normal diet plus extra carbs. Otherwise you just feel bloated and heavy.
- Go lower-fibre as you close in: White rice, white pasta, potatoes, ripe bananas, honey, sports drinks, and low-fibre cereals digest cleanly and leave less in the gut on race morning.
- Expect 1-2 kg of scale weight: Each gram of stored glycogen holds ~3 g of water. That water weight is the point — it's fuel, not fat, and it comes with hydration built in.
- Pair it with the taper: Training volume must drop so the carbs actually store instead of getting burned. Loading without tapering half-defeats the purpose.
Done right, carb-loading is the difference between finishing strong and hitting a wall on the back-half runs when your legs have nothing left to give.
The HYROX Race-Morning Meal and Timing
Your race-morning meal follows one rule this entire HYROX nutrition guide keeps repeating: familiar food, timed to digest. The goal is to top off liver glycogen (which drains overnight) without leaving a brick in your stomach when the gun goes off.
- Carbs: 1-4 g/kg, and let the clock set the amount. Eating 3-4 hours out? You can handle a larger 3-4 g/kg meal. Eating 1-2 hours out? Keep it small and simple at 1-2 g/kg.
- Keep it low-fat, low-fibre, moderate-protein: Oatmeal with banana and honey, white toast with jam, a bagel, or rice with a little lean protein. Skip the high-fibre, high-fat cooked breakfast — it digests slowly and risks GI trouble.
- Top-up 30-60 min before: A banana, a gel, or a few sips of sports drink adds 20-40 g of quick carbs without sitting heavy.
- Caffeine, if you use it: Around 3 mg/kg taken 45-60 minutes before start is a well-supported performance aid — but only if you've trained with it and tolerate it.
The single most common race-morning error is under-eating out of nerves. A too-light breakfast leaves you fumes-only by the sled and wall balls. When in doubt, eat a bit earlier so you can eat a bit more.
In-Race HYROX Fueling: Carbs, Fluid and Sodium
Whether you need in-race fuel depends on your finish time, and this is where a HYROX nutrition guide has to be honest about ranges. Sub-60-minute athletes can often race on breakfast and a pre-race gel alone. Once you're past roughly 60 minutes — which is most of the field — mid-race carbs start to matter.
| Race duration | Carbs/hour | Fluid/hour | Practical intake |
|---|---|---|---|
| Under ~60 min | 0-30 g | ~300-500 ml | Often just water; optional single gel if you feel low. |
| 60-90 min | 30-60 g | 400-800 ml | 1-2 gels or chews spread out; sip at every run/station transition. |
| 90+ min | 45-60 g | 500-800 ml | Stay at the top of the 30-60 g range — sip a carb drink and take a gel every ~30 min. |
- Sodium: 300-700 mg per litre of fluid. HYROX is hot, indoor and sweaty; sodium keeps you drinking and may help reduce cramping in some athletes better than plain water.
- Take it in around the runs, not the stations: Sipping and swallowing a gel is far easier during a run leg than mid-burpee-broad-jump.
- Never debut anything: Every gel, chew, and drink must have been rehearsed in hard training. Race day is not a taste test.
Common HYROX Nutrition Mistakes
Most HYROX nutrition failures aren't exotic — they're the same handful of errors repeated, and every one is avoidable. Fix these and you've done 90% of the job:
- Trying new food on race day: The number-one gut-wrecker. New gel, new pre-race meal, new caffeine dose — any of them can send you to the toilet instead of the finish. Rehearse everything.
- Under-fuelling breakfast: Nerves make people skip or shrink the race-morning meal, then they fade on the back half. Eat the planned 1-4 g/kg.
- Loading fat and fibre with the carbs: Stacking extra carbs on top of a normal diet during carb-load just bloats you. Swap in carbs, swap out fat and fibre.
- Ignoring sodium: Drinking only plain water in a hot HYROX hall dilutes you and invites cramps. Get 300-700 mg sodium per litre.
- Over-drinking: Chugging water on nerves is as bad as under-drinking — it sloshes, dilutes sodium, and helps nothing. Drink to a plan and to thirst.
- Skimping on carbs all training block: You can't out-load-week a chronically under-fuelled block. Daily 5-8 g/kg is what makes race week land.
Putting Your HYROX Nutrition Plan Together
A complete HYROX nutrition plan is just these layers stacked: fuel every training week at 5-8 g/kg carbs and 1.6-2.2 g/kg protein, carb-load to 7-10 g/kg for the final 48-72 hours while you taper, eat a familiar 1-4 g/kg breakfast timed to digest, and — for any race past ~60 minutes — take 30-60 g carbs and 400-800 ml of sodium-dosed fluid per hour. None of it is exotic, and none of it should be improvised on the day.
The through-line of this entire HYROX nutrition guide is rehearsal: the athletes who fuel best on race day are the ones who practised race-day fuelling in training. Nail your daily eating first, dial in your carb-load and breakfast in a tune-up event, and let the numbers here be your checklist — not a surprise you're reading for the first time at the start line.
Common questions
How much should I carb-load before a HYROX race?
Aim for 7-10 g of carbs per kg of bodyweight per day across the final 48-72 hours — roughly 560-800 g/day for an 80 kg athlete. Swap fat and fibre out for carbs rather than adding on top, and expect 1-2 kg of water weight, which is stored fuel.
What should I eat on HYROX race morning?
Eat a familiar, low-fibre, low-fat carb meal of 1-4 g/kg, 1-4 hours before the gun — oats with banana and honey, white toast with jam, or a bagel. The earlier you eat, the more you can eat. Add a small gel or banana 30-60 minutes before if you like.
Do I need to fuel during a HYROX race?
If you finish under about 60 minutes, breakfast plus an optional pre-race gel is usually enough. Past 60 minutes — most of the field — take 30-60 g of carbs per hour from gels or drink, plus 400-800 ml of fluid with 300-700 mg of sodium per litre.
How many carbs per day should I eat in HYROX training?
Eat 5-8 g of carbs per kg of bodyweight per day, scaled to the session: nearer 4-5 g/kg on easy days and 7-8 g/kg on hard interval or sled days. Pair that with 1.6-2.2 g/kg of protein to recover from both the running and the strength stations.
What are the biggest HYROX nutrition mistakes?
The top mistakes are trying new food on race day, under-eating breakfast out of nerves, stacking fat and fibre onto your carb-load instead of swapping, skipping sodium in a hot hall, and over-drinking plain water. Every one is avoidable by rehearsing your fuelling in training.