How many carbs do HYROX athletes need per day?

Between 4 and 7 grams per kg of bodyweight depending on training block. Base blocks need 4–5 g/kg, race-specific blocks need 6–7 g/kg, and race week climbs to 7–8 g/kg by 48 hours out.

What should I eat the morning of a HYROX race?

A familiar high-carb low-fibre breakfast 3 hours before start. Our template: 80–100 g dry oats with banana, honey, and whey, plus 500 ml of electrolyte water. Top up with a banana 60 minutes out and a gel 15 minutes out.

Should HYROX athletes carb load before a race?

Yes. Climb to 7–8 g of carbs per kg of bodyweight in the 48 hours before race day, drop fat and fibre, and expect 1–2 kg of water weight gain — that is stored glycogen and water working exactly as intended.

What supplements help with HYROX performance?

Creatine (3–5 g daily), beta-alanine (3–5 g daily), pre-race caffeine (3–6 mg/kg), sodium for hydration, and vitamin D3+K2 if you live in Vancouver. Skip BCAAs, exogenous ketones, and most pre-workouts.

How much protein do HYROX athletes need?

1.6–2.2 g per kg of bodyweight per day, split across 4 meals of 30–50 g. Spread it across breakfast, lunch, post-training, and dinner instead of dumping it all at dinner.

The HYROX Nutrition Guide: What to Eat to Race Faster

From daily macros to the exact pre-race breakfast, this is the HYROX nutrition framework we use to keep Vancouver athletes fueled, lean, and racing fast.

You can train perfectly and still race poorly if you eat like someone who is not racing. HYROX is a 60–90 minute mixed-modal event that burns through glycogen, depletes electrolytes, and demands a body that is fueled, not just trained.

New to racing? Start with what HYROX is and why everyone's training for it, then dial in your fuel.

This is the nutrition framework we use with HYROX athletes inside our HYROX program at CrossFit BC. It is built for athletes who want to PR, not for influencers selling powder.

Pair this with our HYROX recovery guide and our 12-week race-prep timeline, and you have the full system.

The Daily Macro Framework

HYROX is a glycogen-hungry sport. Most athletes we coach are eating 30–40% fewer carbs than they need, then wondering why their second-half splits collapse. Here is the baseline.

Carbohydrates

Base block (long Zone 2 + light strength): 4–5 g per kg of bodyweight per day.
Strength + power endurance block: 5–6 g per kg.
Race-specific intensity block: 6–7 g per kg.
Race week: 7–8 g per kg by 48 hours out.

For a 75 kg athlete in race-specific block, that is 450–525 g of carbs daily. Rice, potatoes, oats, fruit, sourdough, pasta, boring works.

Protein

1.6–2.2 g per kg of bodyweight per day, split across 4 meals of 30–50 g.
Front-load it. Most athletes get 60% of their protein at dinner. Spread it: breakfast, lunch, post-training, dinner.

Fat

0.8–1.2 g per kg per day. Enough to support hormones, not so much it crowds out carbs.
Olive oil, avocado, fatty fish, eggs, nuts. Skip the keto experiment. HYROX is not the sport for it.

Training-Day Fueling

Pre-session (60–90 minutes out)

40–80 g carbs + 15–25 g protein, low fat, low fibre.
Examples: oatmeal with banana and whey, rice cakes with honey and turkey, white toast with eggs.

Intra-session (only for sessions over 75 minutes)

30–60 g carbs per hour as a sports drink, gel, or chews.
Practice your race-day fuel in training, never on race day.

Post-session (within 60 minutes)

30–60 g carbs + 25–40 g protein.
Real-meal options: rice + chicken + veg, oats + Greek yogurt + berries, salmon bowl with rice and edamame.

Hydration: The Variable Most Athletes Ignore

HYROX is run indoors at race-day humidity that catches Vancouver athletes off guard. Our minimums:

Daily: 35–40 ml per kg of bodyweight, plus another 500–750 ml per hour of training.
Electrolytes: 1–2 g sodium daily for heavy trainers, more in summer or after sauna.
Race day: Start sipping electrolytes 90 minutes before the start. 500 ml total in the hour before, then small sips throughout the race.

Race-Week Carb Loading

Forget the old-school depletion phase. Modern carb loading is simpler and works.

Day -3 to -2: Carbs climb to 7–8 g per kg. Drop fat and fibre. Volume drops, so you are not burning what you are eating, you are storing it.
Day -1: Same carb intake. Hydrate. Add 1–2 g sodium beyond your normal intake. Last big meal 14–16 hours pre-race.
Race morning: Familiar breakfast 3 hours out, 1.5–2 g carbs per kg. Examples: large bowl of oats with banana and honey, bagel with jam and whey, rice with eggs and fruit.

Expect to gain 1–2 kg of water weight. That is stored glycogen + water doing exactly what you want it to do. Do not panic. Do not skip the load.

Supplements That Actually Move the Needle

Most supplements are noise. These are the ones with strong evidence for HYROX athletes:

Caffeine. 3–6 mg per kg, 45–60 minutes pre-race. Test in training first. Worth 1–3% in performance.
Creatine monohydrate. 3–5 g daily, year-round. Helps with sleds, sandbags, and repeated efforts.
Beta-alanine. 3–5 g daily for the lactic-acid heavy stations. Effects build over 4–6 weeks.
Sodium. Cheap, evidence-backed, and most athletes are under-dosed.
Vitamin D3 + K2. Vancouver winters are real. Get tested, supplement to a 25(OH)D level of 100–150 nmol/L.

What we do not bother with: BCAAs (covered by protein intake), exogenous ketones (won't help here), nitric oxide boosters (placebo for most), and most pre-workouts (just buy caffeine and an electrolyte tab separately).

The Pre-Race Breakfast Template

Race day is not the day to experiment. Use this template, tested in training first.

3 hours before start:

Large bowl of oats (80–100 g dry) with banana, honey, and a scoop of whey.
500 ml water with electrolytes.
Black coffee if it is part of your normal routine.

60 minutes before start:

Small banana or 1–2 dates.
250 ml water with electrolytes.

15 minutes before start:

One gel (20–30 g carbs) or 4–6 chews if your stomach handles them.
Small sip of water.

The Nutrition Mistakes That Tank Race Day

Trying new food on race morning. Famous, common, and avoidable.
Under-eating in race week to "feel light." You will feel light, then bonk at station 5.
Skipping the post-session meal. The window matters more than the macros if you skip it entirely.
Caffeine roulette. Tripling your normal dose on race day. Train it first.
Hydration without sodium. Drinking water alone in race week dilutes you and worsens cramps.

The Bottom Line

HYROX nutrition is not complicated, but it is precise. Hit the carb floor, spread the protein, fuel the sessions, hydrate with electrolytes, and never experiment on race day.

Want this built into your training plan with weekly check-ins? Our HYROX program in Vancouver includes nutrition guidance alongside the programming, so the fueling and the training move together.