What to Eat the Week of a HYROX Race (Hour by Hour)

Race week nutrition gets over-engineered by people who have read marathon advice and under-engineered by people who have not read any. HYROX sits in an awkward middle: long enough that fuelling matters, short enough that most of the elaborate protocols are unnecessary.

Here is the whole week, in order.

Monday to Wednesday: change almost nothing

Your training volume is dropping in the taper, so your energy needs drop slightly. Do not cut calories to match.

Eat normally, at maintenance. This is the week to arrive fully recovered, and a deficit in race week costs you more than the small amount of body fat it might remove. If you have been dieting into the race, stop now — the reasoning is in the calorie deficit that doesn't kill your training.

Two things to actually do:

• Hydrate consistently, rather than drinking a lot on Friday. Pale straw urine is the target and the whole test.
• Keep protein at your normal target, 1.6 to 2.2 g/kg. It does not change for a race.

Thursday to Friday: raise the carbohydrate

This is the light version of carb loading, and light is correct for a 60 to 90 minute event.

Target roughly 7 to 10 g/kg of bodyweight per day for the final two to three days. For a 75 kg athlete that is 525 to 750 g of carbohydrate daily.

That is a lot of food, and the trick is that it should displace fat rather than add to it. Fat is calorie-dense and slows gastric emptying, so as carbohydrate goes up, fat comes down. Rice, pasta, potatoes, bread, fruit, juice, oats.

You will gain 1 to 2 kg. Each gram of stored glycogen holds roughly 3 g of water with it. This alarms people every single time and it is exactly what you wanted — that water is coming with you as usable fuel and thermal buffer.

Practical note: spreading this across four or five smaller meals is considerably more comfortable than three enormous ones, particularly on Friday.

Friday evening: the fibre decision

This is the mistake that ruins first-timers' races, and it is almost always fibre.

Fibre is good for you on 51 weeks of the year. In the 24 hours before a race it is a liability: it slows gastric emptying, draws water into the gut and produces exactly the bloating and urgency you do not want at kilometre four with a sled ahead of you.

From Friday evening, cut fibre sharply:

• Choose: white rice, white bread, white pasta, peeled potatoes, bananas, fruit juice without pulp, lean protein
• Avoid: large salads, raw vegetables, beans and lentils, wholegrain everything, nuts and seeds, and anything unusually spicy or rich

Dinner Friday should be a meal you have eaten fifty times. Nothing new. A restaurant meal you cannot see the inside of is the wrong risk on the wrong night — the estimation problem is the same one described in eating out and still hitting your macros, except here the cost is not calories, it is your race.

Race morning: the hour-by-hour

Work backwards from your wave time. Every timing below is relative to it.

T-4 to T-3 hours — the main meal.

1 to 2 g of carbohydrate per kg, low fat, low fibre, entirely familiar.

• White toast with jam or honey, plus a banana
• Porridge made with water, plus honey
• White rice with a small amount of lean protein

For a very early wave — a 7am start means a 3am breakfast, which nobody wants — eat something smaller at T-2 and accept the compromise. A slightly under-fuelled race beats a race spent processing a large meal.

T-2 hours — stop drinking large volumes. Sip from here.

T-90 to T-60 minutes — caffeine, if you use it. 3 to 6 mg/kg. Start at the low end. If you do not normally take caffeine, race day is not the day to introduce it.

T-60 to T-45 minutes — optional top-up. 20 to 30 g of simple carbohydrate: a banana, a sports drink, half a gel. Only if you feel you need it.

T-45 to T-20 minutes — warm up. Nothing solid from here. Small sips of water or sports drink.

T-20 to T-0 — final sips only. Empty your bladder. Get in the corral.

During the race

For most people at most times: nothing.

A 60 to 90 minute effort sits comfortably inside stored glycogen if you arrived properly fuelled. And the practical reality is that consuming anything mid-HYROX is genuinely awkward — your grip is wrecked, your heart rate is 180, and the roxzone is not a place you want to be fumbling with a wrapper. Time lost to the attempt frequently exceeds the benefit.

Water at the stations if it is offered and you want it, particularly in a hot venue.

If your race will exceed roughly 100 minutes, one gel around halfway is reasonable — taken in a roxzone, rehearsed in training beforehand. Never for the first time on race day.

Afterwards

Less urgent than the internet suggests, but worth doing.

• Within an hour: carbohydrate and protein, roughly 1 g/kg carbs and 25 to 40 g protein. Whatever you can face.
• Fluid: roughly 1.5 litres for every kilogram of bodyweight lost, spread over the following hours rather than at once.
• Then eat properly. You have earned it and the glycogen resynthesis is genuinely improved by it.

The rules that actually matter

Everything above compresses to four lines, and if you remember nothing else, remember these.

1. Nothing new on race day. Not the breakfast, not the drink, not the gel, not the caffeine dose.
2. Cut fibre for 24 hours. More races are ruined by gut distress than by glycogen depletion.
3. Eat the main meal 3 to 4 hours out, not one hour out.
4. Rehearse it. Do the exact breakfast, timing and warm-up before your longest simulation session, at least twice.

That last one converts all of this from advice into a plan you have already tested. Which is the same principle as knowing your compromised running pace rather than hoping it resembles your 5K — on race day you want to be executing something familiar, not finding out.

The nutrition will not win you the race. It is, however, one of the few things on the day that can comfortably lose it for you, and it is entirely within your control the week before.