Most HYROX athletes do not strictly need carbohydrate during a 60-90 minute race if they arrive well fuelled, because muscle glycogen can power an effort of that length. Mid-race carbs mainly help slower finishers over 90 minutes, those who under-ate beforehand, or anyone chasing a marginal gain, and only if rehearsed in training first.
- A well-fuelled athlete usually has enough stored glycogen for a 60-90 minute HYROX.
- Efforts beyond roughly 90 minutes benefit most from a small carbohydrate intake mid-race.
- Never trial gels or drinks on race day, the gut must be trained to tolerate them.
Do you need carbs during a HYROX race?
For a well-fuelled athlete finishing in 60-90 minutes, stored muscle glycogen is generally sufficient, so mid-race carbohydrate is optional rather than essential. The science of endurance fuelling suggests external carbohydrate becomes clearly beneficial as efforts stretch past 90 minutes, when glycogen runs lower. This means the athletes who gain most from mid-race fuel are slower finishers, those racing on the back of poor pre-race eating, or anyone in a fasted or depleted state. If you have eaten well in the 48 hours before, the physiological need during a typical race is modest.
Why the 90-minute mark? It is not a magic switch, but it is roughly where a full tank of muscle glycogen starts to run genuinely low for an effort at this intensity. Below that, a gel you swallow at minute 40 barely has time to be absorbed and put to work before you finish, so its real effect is often as much in your head as in your legs. That is not nothing, a lift in the closing runs is a lift, but it is honest to say a fast, well-fed athlete is topping up a tank that was never close to empty. The longer you are out there, the more the sums tip the other way.
When does mid-race fuelling actually help?
Mid-race carbohydrate helps in a few specific situations even if it is not universally required. If your race will take well over 90 minutes, a small dose of easily absorbed carbohydrate can help maintain output in the closing stations and final runs. It also helps anyone who arrived under-fuelled, and some athletes find a gel late in the race gives a psychological lift as much as a physical one. The key is that the benefit is largest for longer efforts and smaller for fast, well-fuelled athletes who finish inside 75 minutes.
| Athlete scenario | Mid-race carbs? | Practical approach |
|---|---|---|
| Sub-75 min, well fuelled | Optional | Water or electrolyte usually enough |
| 75-90 min | Consider one | A single gel around halfway |
| Over 90 min | Recommended | One to two gels spread across race |
| Under-fuelled start | Yes | Early gel to offset the deficit |
What should you take and when?
If you choose to fuel mid-race, a single energy gel providing around 20-30g of carbohydrate, taken with a mouthful of water, is the simplest and most portable option. Timing it around the halfway point of a longer race gives it time to be absorbed before the demanding closing stations. Electrolyte fluid is a separate consideration for hot venues or heavy sweaters, and it does not replace carbohydrate. Whatever you carry must be practical to consume during compromised running or a station transition, which is why gels beat solid food for most.
How do you practise race fuelling?
You should rehearse any mid-race fuelling exactly as you plan to use it, following a clear process. The right sessions to rehearse in are the longest, hardest days late in a training block; if you follow THETA BLUEPRINT, those peak build-phase sessions before the race-week taper are the ones that mimic race demand closely enough for the rehearsal to mean something.
- Choose one carbohydrate product and one flavour, then use only that in testing.
- Take it during hard interval or race-simulation sessions, not easy runs, to mimic race intensity.
- Practise the mechanics, opening, swallowing and drinking water while moving.
- Note any gut discomfort and adjust dose or timing before you commit to it.
- Lock in the exact product, dose and timing at least two weeks before the race.
What about hydration during the race?
Hydration is a separate question from carbohydrate, and for a 60-90 minute indoor race most well-hydrated athletes need only small amounts of fluid rather than large volumes. Sipping water or an electrolyte drink at natural points helps in warm venues or for heavy sweaters, but over-drinking mid-race can cause stomach sloshing and discomfort. Arriving well hydrated matters more than drinking heavily during the race itself. Treat fluid and carbohydrate as two independent decisions based on venue conditions and your own sweat rate.
How does pre-race fuelling change your in-race needs?
How well you eat in the 48 hours before a race directly changes whether you need carbohydrate during it. An athlete who arrives with topped-up glycogen from carb-forward eating has a full tank and rarely needs to fuel a 60-90 minute effort, whereas someone who under-ate, trained fasted or skipped breakfast starts partially depleted and benefits from an early gel. This is why race nutrition should be planned as a whole, from the two days before to the finish line, rather than as isolated mid-race decisions. Get the pre-race fuelling right and mid-race carbohydrate becomes an optional top-up; get it wrong and a gel becomes damage limitation.
What about caffeine and other race-day aids?
Caffeine is one of the better-evidenced performance aids and some athletes take it before a HYROX to reduce perceived effort, typically as a pre-race dose rather than mid-race, and it should be trialled in training to confirm tolerance. Caffeinated gels combine a small carbohydrate top-up with the stimulant effect, which suits longer races. Beyond caffeine, most race-day supplements offer little for a 60-90 minute effort and are not worth the gut risk of trying something new. As with all fuelling, the rule is that anything you use on race day must first have been rehearsed in hard training, because the start line is no place to discover how your stomach reacts.
Where in the race can you actually take a gel?
Here is the practical snag people forget: HYROX does not hand you a quiet mile to fiddle with a wrapper. You are either running compromised, gripping something heavy, or transitioning between the two. So if you are going to fuel, plan the exact moment. The runs are the only realistic windows, and of those, one of the earlier-to-middle runs is best, when your hands and stomach are calmer than they will be at station six or on the run out of the sled push.
Rehearse the mechanics, not just the dose. Can you open the gel with sweaty hands while jogging? Can you get it down without a coughing fit and chase it with a mouthful of water at the next station? A gel you cannot physically take mid-effort is worth nothing, however good the fuelling logic. Tuck it somewhere you can reach without breaking stride, a waistband pocket rather than deep in a zip, and know before the gun which run it is coming out on. A little planning here saves a fumbled, half-swallowed mess that upsets your stomach for the back half.
Common questions
Do I need a gel during a HYROX race?
Most well-fuelled athletes finishing in 60-90 minutes do not strictly need a gel, because stored glycogen covers the effort. A gel becomes worthwhile for races over 90 minutes, under-fuelled starts, or a marginal late-race boost, provided it has been rehearsed in training.
How many carbs should I take during HYROX?
If you fuel mid-race, a single gel of around 20-30g of carbohydrate is a sensible dose for a typical HYROX, with a second added only for efforts well beyond 90 minutes. Take it with a mouthful of water for easier absorption.
When should I take a gel during the race?
Around the halfway point of a longer race is a practical time, giving the carbohydrate time to be absorbed before the demanding closing stations and final runs. For most sub-75-minute athletes, a gel is optional rather than necessary.
Can I eat solid food during HYROX?
Solid food is impractical during a fast, high-intensity race because it is hard to chew and digest while moving, so gels or liquid carbohydrate are preferred. Any in-race food should be tested thoroughly in training to confirm your gut tolerates it.
Will a gel upset my stomach mid-race?
A gel can cause gut distress if your digestive system has not been trained to handle carbohydrate at intensity, which is why rehearsal is essential. Practising with your chosen product during hard sessions greatly reduces the risk on race day.
Sources
- Established endurance-nutrition principles for carbohydrate use during exercise
- HYROX official race format information (hyrox.com)
- THETA coaching data, 2024-2026