HYROX fueling: what to eat before and during

No study has tested HYROX fueling yet. Here’s what endurance research suggests. · 2 min read · Updated October 1, 2026

In short: We found no study that tested fueling in HYROX itself, so the advice comes from endurance research. For a race around an hour, small amounts of carbohydrate (even a mouth rinse) can help; beyond an hour, 30–60 g per hour is the usual target. Eat a familiar carb-rich meal 3–4 hours before, and rehearse it.

How we made this guide: we built it from the research below and checked every number against it: Brandt et al., HYROX physiology study (2025); Rappelt et al., seven seasons of PRO and ELITE results (2026); Burke et al., carbohydrates for training and competition (2011); Jeukendrup, carbohydrate intake during exercise (2014); ISSN position stand on nutrient timing (2017); Hargreaves et al., pre-exercise carbohydrate (2004); Belval et al., practical hydration solutions (2019).

Most HYROX fueling advice is borrowed from running or CrossFit. That’s fair, because we found no study that has tested fueling in HYROX itself yet. Here’s how the closest research applies.

How long your race is decides the plan

ELITE finishers take roughly an hour (median about 57 minutes for men and 63 for women in the latest season studied by Rappelt et al., 2026). A group of 11 recreational athletes took a median of 86.5 minutes in a simulated race (Brandt et al., 2025). That difference changes what you need.

Your expected finish	What the research suggests during the race
About 1 hour or less	Small amounts of carbohydrate, or even rinsing a sports drink in your mouth, can help. Big amounts aren’t needed.
Over 1 hour	About 30–60 g of carbohydrate per hour.

From Burke et al., 2011, Jeukendrup, 2014 and the ISSN nutrient timing stand, 2017. These come from endurance studies, mostly in trained athletes; beginners may need less.

The mouth rinse, explained

For hard efforts around an hour, swishing a carbohydrate drink in your mouth and spitting it out has improved performance in some studies. The effect seems to come from the brain sensing carbohydrate, not from extra fuel reaching the muscles (Burke et al.). For HYROX, that points to a few sips of sports drink for a finish around an hour. That’s our extrapolation from endurance studies, so test it in a simulation.

Before the race

Eat 3–4 hours before. Carbohydrate eaten 3–4 hours before exercise tops up liver and muscle glycogen (Hargreaves et al., 2004). The same paper notes people respond differently, and your own experience should guide the details.
Keep it familiar and easy to digest. See our race breakfast guide for amounts by body weight.

Watch your stomach

Running and jumping jostle the gut more than smooth activities like cycling (Belval et al., 2019), and HYROX adds burpees and wall balls on top. Whatever you plan to take during the race, try it in a full simulation first.

Rehearse it

Do at least one race simulation with your planned breakfast, timing and race-day drink. Write down what you ate, when, and how your stomach felt by the wall balls. We built My Track Record so logging the meal is one spoken sentence.

Log every simulation and what you ate before it.
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By My Track Record. We built My Track Record so logging food and training takes one spoken sentence, and we put these guides together from the published sports science research cited on each page.

Sources

Brandt T, Ebel C, Lebahn C, Schmidt A. Acute physiological responses and performance determinants in Hyrox©: a new running-focused high intensity functional fitness trend. Front Physiol. 2025;16:1519240. Source
Rappelt L, et al. Longitudinal performance development in PRO and ELITE HYROX competitions across the first seven competitive seasons. Front Physiol. 2026;17:1847569. Source
Burke LM, Hawley JA, Wong SH, Jeukendrup AE. Carbohydrates for training and competition. J Sports Sci. 2011;29 Suppl 1:S17–27. Source
Jeukendrup A. A step towards personalized sports nutrition: carbohydrate intake during exercise. Sports Med. 2014;44 Suppl 1:S25–33. Source
Kerksick CM, et al. International Society of Sports Nutrition position stand: nutrient timing. J Int Soc Sports Nutr. 2017;14:33. Source
Hargreaves M, Hawley JA, Jeukendrup A. Pre-exercise carbohydrate and fat ingestion: effects on metabolism and performance. J Sports Sci. 2004;22(1):31–38. Source
Belval LN, et al. Practical hydration solutions for sports. Nutrients. 2019;11(7):1550. Source

General information for healthy adult HYROX athletes, not medical advice. If you have a medical condition, are pregnant, or have a history of disordered eating, talk to a doctor or registered dietitian before changing how you eat.