Yes, you should top up carbohydrate before HYROX, but you do not need extreme carb-loading. A 60 to 90 minute race is well within your glycogen stores if you eat well in the final day or two. The practical answer for most amateurs is a carbohydrate-rich day before, a familiar pre-race meal, and a light top-up an hour or two out.
Do you actually need to carb load for HYROX?
Not in the classic, depletion-then-loading sense used for marathons and longer events. Full muscle glycogen stores comfortably fuel an hour or so of hard work, so a HYROX effort sits within reach of a well-fed athlete without any special protocol. What you need is to arrive with topped-up stores and stable energy, which comes from eating normally-to-generously on carbohydrate in the day before. In my coaching experience, the athletes who overthink this and force down huge volumes of food end up bloated on the start line, the opposite of what they wanted.
What should you eat the day before?
Make the day before carbohydrate-forward but familiar. Base meals around rice, pasta, potatoes, bread and fruit, keep protein moderate, and go easy on very high-fat and very high-fibre foods that slow digestion or upset the stomach. Hydrate steadily through the day rather than gulping water at the last minute. The single most important rule is to eat foods you have eaten before hard sessions. The day before a race is not the time to experiment with anything new, however good the nutrition advice sounds.
| Timing | What to eat | Goal |
|---|---|---|
| Day before | Carb-rich, familiar meals; moderate protein; low fibre later | Top up glycogen, settle the gut |
| 2-3 hours before | Familiar carb meal, lower fat and fibre | Fuel without heaviness |
| 30-60 min before | Small carb snack (banana, gel) if needed | Final top-up |
| During | Nothing needed for most; water only | Race is short enough |
What is the ideal pre-race meal?
Eat a carbohydrate-based meal you trust two to three hours before your start, keeping fat and fibre lower so it clears the stomach in time. Porridge with banana, toast with honey, or rice with a light protein source all work well. Follow a simple approach on the morning:
- Eat your main pre-race meal 2-3 hours before your wave.
- Keep it carbohydrate-led, moderate in protein, low in fat and fibre.
- Add a small carb snack 30-60 minutes out only if you feel you need it.
- Sip water and, in hot conditions, include some electrolytes.
- Stop eating early enough that your stomach feels settled at the start.
Do you need to eat during the race?
For most amateurs, no. A 60-90 minute HYROX is short enough that a well-fuelled athlete will not run out of glycogen mid-race, so eating during the event is usually unnecessary and risks stomach trouble while you are working hard. Athletes racing much longer, such as some doubles or slower first-timers pushing toward two hours, might take a gel around the halfway mark, but only if they have practised it in training. Water is the priority during the race; food rarely is.
"Amateurs love a fuelling strategy because it feels controllable, but I've seen far more races ruined by a heavy stomach than by an empty tank. Eat well the day before, have a meal you trust in the morning, and then trust it. Simple beats clever here." George Wootten, Executive Coach, THETA
How does hydration fit in?
Hydration matters as much as carbohydrate and is easier to get wrong late. Arrive well hydrated by drinking steadily across the day before and the morning of, rather than downing a large volume just before the start, which only sends you to the toilet or leaves your stomach sloshing. In warm venues, add electrolytes to replace what you lose in sweat, since sodium loss can cause cramping and flat legs. As with food, dial in your hydration approach during training simulations so race day is a rehearsal, not a gamble.
What to do when your wave time works against you
The clean two-to-three-hours-before-a-familiar-meal plan assumes a civilised start time. HYROX wave times rarely oblige. Two situations trip athletes up, and both have simple fixes once you have thought them through in advance rather than in a car park at dawn.
The early wave is the first. A 7am start means a 4am to 5am meal, which almost nobody wants to eat. Forcing a full plate down is one way to arrive nauseous. The better move is a smaller, liquid-leaning carbohydrate breakfast that sits easily, for example porridge made loose, or a banana with a carbohydrate drink, topped up with a small snack such as a gel or a slice of toast with honey around 45 minutes out. You are aiming for topped-up, not stuffed, and a fluid meal clears the stomach faster than a solid one when time is short.
The late or delayed wave is the second, and it is the quieter trap. An afternoon start leaves a long morning in which a good breakfast has worn off and nerves have suppressed appetite. The fix is a planned mid-morning carbohydrate snack so you are not running on a breakfast eaten six hours earlier, then your normal pre-race top-up before the wave. Waves also slip in busy venues, so keep a familiar carbohydrate snack in your bag and be ready to nudge your final top-up back if the clock moves. Rehearse whichever pattern your wave forces during a hard training morning, so the timing is proven rather than improvised.
Common questions
Do I need to carb load for a HYROX?
Not in the extreme marathon sense: a 60-90 minute race sits within your normal glycogen stores when you are well fed. A carbohydrate-rich, familiar day before and a trusted pre-race meal are enough for most athletes. Save aggressive carb-loading protocols for much longer events.
What should I eat the morning of a HYROX?
Eat a carbohydrate-based meal you have tested in training, two to three hours before your wave, keeping fat and fibre low. Porridge, toast or rice-based options work well. Add a small carb snack shortly before only if you genuinely need it.
Should I eat during a HYROX race?
Most amateurs do not need to eat during the race because it is short enough to complete on stored glycogen. Slower athletes approaching two hours might take one practised gel around halfway. Otherwise, focus on water rather than food during the event.
How much water should I drink before a HYROX?
Hydrate steadily across the day before and the race morning rather than drinking a large amount right before the start. Aim to arrive well hydrated with pale urine, and add electrolytes in hot conditions. Last-minute gulping tends to cause discomfort without improving hydration.
Can carb loading make me feel sluggish?
Overdoing it can. Excessive food, especially high-fat or high-fibre choices, leaves you bloated and heavy on the start line. The goal is topped-up stores and a settled stomach, not maximum volume. Keep the day before generous but familiar and comfortable.
What foods should I avoid before a HYROX?
Avoid very high-fat, very high-fibre and any unfamiliar foods in the final day, since they slow digestion or risk stomach upset. Stick to carbohydrate sources you have eaten before hard training. Race day is for proven foods only, never experiments.
Sources
- HYROX official race format and results (hyrox.com)
- THETA coaching data, 2024-2026
- Established principles of glycogen storage, pre-competition nutrition and hydration
Fuelling only works when it lands inside a race week that is already tapered and rehearsed, which is the whole point of sequencing the final days properly. That is the part THETA BLUEPRINT lines up for you, so the taper and the fuelling arrive together rather than being two things you try to remember separately in the last 48 hours.