Nutrition for a hybrid race: fuelling 60-90 minutes of mixed effort
Nutrition for a hybrid race: carbohydrate needs, race-week and race-morning fuelling, hydration, sodium, caffeine and everyday eating for athletes.
Dr. Pablo Lozano Lominchar
10 min read
> The information in this article is based on published scientific literature and is for educational purposes only. It does not constitute medical or training advice. Any training programme should be designed and supervised by a qualified coach, with medical clearance from a healthcare professional.
A hybrid fitness race lasts 60–90 minutes for most competitors and is fuelled almost entirely by carbohydrate, because the intensity sits high enough that fat oxidation cannot cover the demand. At that duration the decisive nutritional variables are not in-race gels but the two or three days beforehand, the meal 2–3 hours before the start, and how well hydrated and caffeinated you arrive. This article covers what to eat in race week, what to eat on race morning, how to handle fluid and sodium, how to use caffeine, what is realistically consumable during the race itself, and how to eat day to day so that concurrent strength and running training actually produces adaptation.
Why carbohydrate is the fuel that matters
At the intensities typical of a hybrid race — mostly between threshold and above — carbohydrate supplies the large majority of energy, and total muscle and liver glycogen stores hold only enough for roughly 90–120 minutes of hard work. The stations make this worse, not better: sled pushes, lunges and ergometer efforts are glycolytic bursts that draw heavily on muscle glycogen and produce a metabolic environment in which fat oxidation contributes very little. [1][2]
This has three consequences.
Race week: filling the tank without feeling heavy
In the 48–72 hours before the race, most athletes do well with 6–8 g of carbohydrate per kilogram of body mass per day on the final two days, which for a 75 kg athlete is roughly 450–600 g daily. This is a substantial increase from a typical intake and needs planning. [2]
Practical execution:
- Increase carbohydrate, do not simply eat more of everything. Total calories rise modestly; the increase comes from rice, pasta, bread, potatoes, oats, fruit and juice, not from fat.
- Reduce fibre in the final 24 hours. Swap wholegrain for white, reduce large salads and legumes, and favour lower-fibre fruit. This is the single most effective way to avoid gut problems on race morning.
- Reduce fat in the final 24 hours too. Fat slows gastric emptying and makes the pre-race meal sit heavily.
- Expect to gain 1–2 kg. Each gram of stored glycogen binds water. That weight is fuel, not fat, and it will make you feel slightly heavy and slightly puffy for a day. This is normal and correct.
- Train less, eat the same. Race week volume drops substantially in a well-designed taper, which is precisely why carbohydrate intake can top the stores up rather than merely replace what you burned.
Race morning
Aim to finish your main pre-race meal 2.5–3 hours before your start time, containing roughly 1–3 g of carbohydrate per kilogram of body mass, low in fat and fibre and familiar to your gut. For a 75 kg athlete that is roughly 75–225 g of carbohydrate depending on tolerance and how early the start is.
Examples that work for most people:
- White bread or a bagel with honey or jam, plus a banana and a sports drink.
- Porridge made with water or a low-fat milk, with honey and a small banana.
- White rice with a little salt and a small portion of lean protein.
- If the start is very early, a liquid option: a carbohydrate drink plus a low-fibre cereal bar, eaten 90 minutes out.
Two race-morning errors are extremely common. The first is eating too little because of nerves; the second is drinking large volumes of coffee and water in the final hour, which guarantees a toilet queue and a bloated warm-up. Have your morning drilled and rehearsed before a hard training session at least twice.
Hydration and sodium
Start the race euhydrated rather than over-hydrated, which for most athletes means 5–7 ml of fluid per kilogram of body mass in the 2–4 hours before the start — approximately 400–500 ml for a 75 kg athlete — sipped rather than gulped. Urine that is pale yellow, not clear, is the target. [3][4]
Sweat losses in a 60–90 minute indoor race with poor ventilation can reach 1.0–1.8 L/h in hot conditions, but you cannot and should not try to replace that during the event. The realistic goal is to lose no more than about 2% of body mass. The practical implications:
- Add sodium to your pre-race drink if you are a salty sweater (white marks on kit, gritty skin), roughly 500–1,000 mg of sodium in the 2–3 hours beforehand. This helps retain the fluid you drink.
- In hot venues, drink 150–250 ml at any water point if one exists, but do not force fluid — nausea from sloshing fluid is a more common race-ruiner than mild dehydration over 75 minutes.
- After the race, replace roughly 125–150% of the body mass lost, with sodium, over the following few hours.
Caffeine
Caffeine is one of the few supplements with a robust performance effect for efforts of this duration, typically used at 3–6 mg per kilogram of body mass taken 45–60 minutes before the start — 225–450 mg for a 75 kg athlete. [5]
Sensible use:
- Rehearse the dose in training. Some athletes get jitters, gut upset or a heart-rate rise at doses above 3 mg/kg. Find your ceiling before race day.
- Split it if you prefer. Half with the pre-race meal, half 30 minutes out.
- Do not stack it with a pre-workout of unknown composition. Many contain 300 mg or more plus stimulants you have not tested.
- Consider the evening. Caffeine has a half-life of roughly 4–6 hours; an afternoon race can cost you a night's sleep.
- Do not take caffeine for the first time on race day. Ever.
What you can actually eat during the race
For a 60–90 minute race, in-race carbohydrate is optional and typically limited to 0–30 g in total, because the transitions offer almost no opportunity to consume anything without losing time or provoking nausea. This is the honest answer that most nutrition advice skips.
If your race is closer to 90–110 minutes, or you are in a doubles or relay format with recovery windows, a single gel of 20–25 g of carbohydrate taken around the 40–50 minute mark can help — ideally immediately before a run rather than before a station, and washed down with a mouthful of water. Practise it in a transition session first; taking a gel with a heart rate of 175 is a genuinely different skill from taking one on a Sunday long run.
A carbohydrate mouth rinse — swilling a sports drink for 5–10 seconds and spitting — is a low-risk alternative that some athletes find helpful in the final third when the gut will not tolerate anything else.
Everyday eating for concurrent training
Concurrent strength and running training requires enough energy and protein to support two competing adaptations, which in practice means 4–7 g/kg/day of carbohydrate depending on training volume, 1.6–2.2 g/kg/day of protein, and enough total energy to avoid chronic under-fuelling. [6][7]
The three things that matter most day to day:
Two smaller points worth attention: iron status is a common and easily missed problem in athletes with high running volume, particularly in menstruating women, and is worth checking with a blood test rather than guessing; and vitamin D status is frequently low in athletes training indoors during winter. Both are matters for a healthcare professional, not for self-prescription.
Nutrition supports the plan; it does not replace it. The training itself — the balance of easy and hard running, the strength dose, the transition work — is what determines your result. See how to pace a hybrid race for the race-execution side of the same problem, and running on tired legs for why the runs after stations feel the way they do.
Frequently asked questions
Should I carb-load for a 70-minute hybrid race?
Yes, but a modest version. Two days at roughly 6–8 g of carbohydrate per kilogram of body mass, with reduced fibre and fat in the final 24 hours, is sufficient. The full three-day protocols used for marathons are unnecessary at this duration and tend to leave athletes feeling heavy.
What should I eat on race morning?
A familiar, low-fibre, low-fat meal containing 1–3 g of carbohydrate per kilogram of body mass, finished 2.5–3 hours before the start, plus an optional 20–40 g top-up 30–45 minutes out. White bread with honey and a banana works for a large majority of athletes.
Do I need a gel during the race?
Usually not for efforts under 90 minutes, because you start with enough glycogen and the transitions give you almost no opportunity to eat. If your race runs longer, a single 20–25 g gel around the 40–50 minute mark, taken before a run rather than a station, is the practical option.
How much caffeine should I take and when?
A commonly used range is 3–6 mg per kilogram of body mass, 45–60 minutes before the start, but only if you have rehearsed that dose in training. Start at the low end. Never trial caffeine, or any supplement, for the first time on race day.
Putting it together
For a 60–90 minute hybrid fitness race, nutrition is mostly a preparation problem, not an in-race one: fill the tank over 48 hours, eat a familiar low-fibre meal 2.5–3 hours out, top up 30 minutes before, arrive properly hydrated with sodium on board, use caffeine you have already tested, and accept that you will eat very little during the event itself. Day to day, eat enough to support both halves of concurrent training.
If you want a 12-week concurrent plan that tells you which sessions are the hard ones worth fuelling properly, the plan generator at hybridbeastbrain.com is completely free — build your plan here. The training rationale behind it is on the science page, and the event calendar is on the races page.
References
The claims above are sourced to the papers below, numbered in the order they appear in the text. Where a number sits at the end of a paragraph, it points to the work that claim rests on.
Dr. Pablo Lozano Lominchar, MD, PhD, EBPSM
Surgical Oncologist · Hospital General Universitario Gregorio Marañón, Madrid
Specialist in peritoneal malignancies, sarcomas, and complex pelvic surgery. Associate Professor of Surgery at Complutense University of Madrid. Hybrid athlete and creator of the HybridBeastBrain training engine.
ORCID: 0000-0002-5413-8449
How this article was made: it is a summary of the available scientific literature, not original research. The search and the summarising were done with AI assistance, and the accuracy was then checked by hand against the sources cited. If you spot an error, write to us and we will correct it.