Optimizing Nutrition for Long Training Days

Many endurance athletes have their in-session nutrition dialed in. They know precisely how many grams of carbohydrates to consume per hour and have a clear strategy for achieving that target during training and racing. This precision is essential for success in long-course triathlon, Ironman, and ultra-distance events. However, pre- and post-training meals are frequently overlooked — and their importance is often underestimated.

As training duration increases throughout a build phase, pre-session meals become increasingly critical. Eating a well-planned breakfast before a long training session helps replenish liver glycogen depleted overnight, restores glycogen from the previous session, supplies glucose to the central nervous system, and can enhance the effectiveness of your in-session fueling. Post-training meals are equally important; they restore what was expended during the workout and ensure adequate recovery, so you are ready to perform at your next session.

Managing Training Load

An athlete's ability to sustain training load over time is one of the strongest predictors of endurance performance and long-term progress. Training load is the combined product of intensity and volume — and even age-group long-course triathletes and ultra-runners carry remarkably high loads, often training 10 to 20+ hours per week.

At this volume, optimizing in-session nutrition alone is not sufficient. Establishing consistent eating habits before and after workouts ensures you begin each session fully fueled and recover completely before the next one. Failing to prioritize nutrition around your training sessions is one of the most common and consequential mistakes athletes make during high-volume training blocks.

Building Your Pre-Training Nutrition Plan

Starting to develop a structured pre-training meal plan will help you identify what works

best for you individually — and it doubles as the foundation for your race-morning nutrition routine. Just like race-day fueling, pre-race meals should be practiced throughout the training cycle to establish tolerance and eliminate surprises on race day.

Timing and Carbohydrate Targets

For longer workouts, aim to consume your pre-training meal 2–4 hours before the start. This window allows adequate digestion and minimizes the risk of gastrointestinal distress during the session.

A practical guideline for carbohydrate intake is to match grams per kilogram of body weight to the number of hours before training starts:

Time Before Training	Carbohydrate Target
1 hour	1 g/kg
2 hours	2 g/kg
3 hours	3 g/kg
4 hours	4 g/kg

Example: A 70 kg athlete eating 3 hours before training should target approximately 210 g of carbohydrates. A 60 kg athlete eating 2 hours prior should aim for 120 g. As the time before training shortens, reduce carbohydrate intake accordingly.

Pre-Workout Gel

Consuming an additional gel (25–30 g of carbohydrates) 15–30 minutes before the start of your workout can help stabilize blood glucose and settle the stomach as you prepare to begin.

Fluid Intake

Athletes should consume 5–10 mL of fluid per kg of body weight in the 1–4 hours leading

up to training. This can include a combination of water, coffee, tea, and electrolyte drinks. Electrolyte replacement beverages have the added benefit of providing sodium and other electrolytes needed as sweat loss begins. For the 70 kg athlete, that translates to 350–700 mL of fluid prior to training.

Post-Training Nutrition: Prioritizing Recovery

Recovery nutrition should begin immediately after training is complete. This becomes especially critical when training sessions are separated by less than 8 hours.

Carbohydrate Replenishment

It is recommended that athletes consume 1.0–1.2 g of carbohydrates per kg of body weight per hour for the first 4 hours following exercise. For a 70 kg athlete, that is approximately 70–84 g of carbohydrates each hour over four hours. While this may seem like a substantial amount, meeting this target fully replenishes glycogen stores depleted during the session and best prepares the body for subsequent training demands.

If post-exercise appetite suppression makes full meals difficult, start with small, carbohydrate-rich snacks to stimulate appetite. Liquid nutrition options — such as smoothies or protein shakes — can also be effective immediately following a session. Pairing carbohydrates with protein-rich foods further supports recovery by stimulating muscle protein synthesis and accelerating tissue repair.

Fluid and Electrolyte Replacement

Athletes should aim to replace 1.25–1.5 L of fluid for every kilogram of body weight

lost during exercise. Using the example of the 70 kg athlete, if they lose 1.5 kg during a long session, they should consume approximately 1.8–2.25 L of fluid during recovery. Combining electrolyte replacement beverages with water ensures that sodium and other electrolytes lost through sweat are adequately restored.

Planning Around Big Training Blocks

During high-volume training blocks, it is essential that athletes emphasize carbohydrate-rich foods at every meal. On the day before a particularly demanding workout, increasing overall carbohydrate intake helps saturate muscle glycogen stores and sets you up to perform the required training effectively. Day-after-day performance depends on this kind of structured meal planning as much as it depends on the workouts themselves.

Closing Thoughts

Establishing a well-structured pre- and post-training nutrition plan is essential for avoiding under fueling as training loads increase. It also provides a reliable framework for developing your pre-race meal routine and building confidence in your overall race-day strategy. You have put in the training — don't allow a poorly planned nutritional approach to undermine everything you have worked for.

If you’re putting in the hours but not seeing the performance gains you expect, your nutrition outside the session could be the missing link. Start applying these pre- and post-training strategies to ensure you’re fueling each workout with purpose and recovering with intent. The athletes who consistently execute here are the ones who stay healthy, absorb higher training loads, and show up on race day ready to perform.

Let us help you take control of your nutrition now so every session moves you closer to your full potential. Contact NVDM Coaching for the support you need to be your best!