For HYROX training weeks, a practical daily target is roughly 1.6–2.2g of protein per kilogram of body weight, 4–7g of carbohydrate per kilogram scaled to training load, and enough fat to fill the remaining calories. As of 2026, carbohydrate is the dial you turn up on hard days and down on easy days, while protein stays consistently high to support recovery.

• Protein: roughly 1.6–2.2g per kg of body weight daily, spread across meals.
• Carbohydrate: roughly 4–7g per kg, higher on hard running and station days.
• Fat fills the remaining energy, typically around 0.8–1.2g per kg for most athletes.

How much protein do you need for HYROX training?

Protein supports muscle repair and adaptation, and for hybrid athletes training hard several times a week a daily intake of roughly 1.6–2.2g per kilogram of body weight is a well-established target. A 75kg athlete therefore aims for about 120–165g per day, spread across three to four meals of 30–40g rather than loaded into one sitting. Higher intakes within this range suit heavier training loads and those trying to preserve muscle while losing fat. Consistency day to day matters more than hitting an exact number, so build meals around a protein source first.

How much carbohydrate should you eat?

Carbohydrate is the fuel that powers compromised running and high-output stations, so it should scale with how hard you train that day. A useful range is 4–7g per kilogram of body weight, with the lower end on rest or easy days and the upper end on hard interval, long-run or race-simulation days. For a 75kg athlete that spans roughly 300–525g depending on the session. Timing carbohydrate around your hardest sessions, before and after, improves both performance and recovery more than simply eating the same amount every day.

How much fat and what about total calories?

Fat is essential for hormones and health, so it should not be cut too low; around 0.8–1.2g per kilogram of body weight is a sensible baseline once protein and carbohydrate are set. In practice you set protein first, adjust carbohydrate to training load, and let fat fill the remaining calories. Total energy depends on your goal: eat at maintenance to perform and hold weight, in a modest surplus to build, or in a small deficit of a few hundred calories to lose fat slowly without wrecking training quality. Crash dieting during a hard HYROX block undermines both recovery and performance.

How do you structure macros across the day?

You can hit your targets reliably with a simple daily framework.

1. Anchor each meal with 30–40g of protein to spread intake across the day.
2. Place your largest carbohydrate portions around your hardest session, before and after.
3. Keep easy and rest days lower in carbohydrate but hold protein steady.
4. Fill remaining calories with fats from whole foods such as nuts, oils, dairy and fish.
5. Adjust total intake weekly based on body weight trend, energy and training quality.

"Set protein high and constant, then move carbohydrate up and down with your training load. Most athletes who plateau are simply under-fuelling their hard days and over-restricting on the days that matter," says the THETA coaching team.

Do your macros change on rest days?

On rest and easy days you can lower carbohydrate toward the bottom of the range because you are not depleting glycogen heavily, while keeping protein at your usual daily target to support ongoing recovery. Fat can rise slightly to maintain satisfying meals when carbohydrate is lower. This day-to-day flexing, sometimes called carb periodisation, matches fuel to demand and helps manage body composition without sacrificing performance on key sessions. The principle is to feed the work, not the calendar.

How do you adjust macros for your goal?

Your total calorie intake, set by adjusting fat and carbohydrate around a fixed protein target, determines whether you build, maintain or lose weight. To hold weight and perform, eat at maintenance and let carbohydrate flex with training load. To build muscle, add a modest surplus of a few hundred calories, mostly from carbohydrate on hard days. To lose fat, take a small deficit of a few hundred calories while keeping protein high to protect muscle, and prioritise carbohydrate on your hardest sessions so training quality holds. The mistake most athletes make is cutting too aggressively during a demanding block, which wrecks recovery and performance faster than it removes fat.

Should you track macros or eat intuitively?

Tracking macros for a few weeks is worthwhile even if you do not do it forever, because it teaches you what your usual portions actually contain and where you fall short, most often protein and hard-day carbohydrate. Once you understand your typical intake, you can shift to a lighter approach: anchoring each meal with a protein source, sizing carbohydrate to the day's training, and checking your body weight trend and session quality weekly. Precise tracking suits athletes chasing a specific body-composition change, while experienced trainees can often maintain results by eye. Either way, consistency across the week matters more than perfection on any single day.

Common questions

How much protein should I eat for HYROX training?

Aim for roughly 1.6–2.2g of protein per kilogram of body weight daily, spread across three to four meals of 30–40g. A 75kg athlete therefore targets about 120–165g per day to support recovery from hard hybrid training.

How many carbs do I need on a hard training day?

On hard interval, long-run or race-simulation days, aim toward the upper end of 4–7g of carbohydrate per kilogram of body weight, so around 525g for a 75kg athlete. Concentrate the largest portions before and after the session for performance and recovery.

Should I eat fewer carbs on rest days?

Yes, lowering carbohydrate toward around 4g per kilogram on rest and easy days matches fuel to demand and helps manage body composition. Keep protein at your normal daily target and let fat rise slightly to keep meals satisfying.

How much fat should I eat while training for HYROX?

Around 0.8–1.2g of fat per kilogram of body weight is a sensible baseline once protein and carbohydrate are set. Fat is essential for health and hormones, so avoid cutting it too low even when trying to lose weight.

Can I lose weight while training for HYROX?

Yes, a modest calorie deficit of a few hundred calories per day allows slow fat loss while preserving training quality, especially if protein stays high. Aggressive crash dieting harms recovery and performance during a hard block, so keep the deficit small.

Do I need supplements to hit my macros?

No, whole foods can meet all your macro targets, though a protein powder is a convenient way to top up daily protein if whole-food meals fall short. Supplements are optional tools for convenience, not requirements.

How do I know if I am eating enough?

Track your body weight trend, energy levels and the quality of your hard sessions over a week or two. Falling performance, persistent fatigue or unwanted weight loss usually signal under-fuelling, most often too little carbohydrate on training days.

Sources

• Established sports-nutrition principles for protein and carbohydrate intake
• HYROX official race format information (hyrox.com)
• THETA coaching data, 2024–2026

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