One of the biggest mistakes I see new triathletes make has nothing to do with swimming technique, bike position, or running form. It's failing to fuel their training.
After more than 25 years competing and coaching endurance athletes, I've learned that many people spend months planning their workouts but almost no time planning what they'll eat. Then they wonder why they feel flat halfway through a long ride, struggle to recover between sessions, or run out of energy on race day.
The good news is that triathlon nutrition doesn't have to be complicated. You don't need expensive supplements or a perfectly calculated meal plan. In most cases, consistently eating the right foods at the right times will have a much bigger impact than chasing the latest nutrition trend.
Training is only half the equation. Your body adapts to training during recovery, and recovery depends heavily on how well you fuel it.
Maintain energy throughout long training sessions.
Support muscle repair after exercise.
Replace glycogen stores ready for your next workout.
Reduce the likelihood of illness during heavy training blocks.
Improve consistency across an entire season.
Of course, nutrition is only one part of the equation. Training at the right intensity matters just as much, which is why our Heart Rate Training for Triathletes guide is a great companion to this article.
I've coached athletes who trained incredibly hard but never reached their potential because they simply weren't eating enough to support the workload.
Think of food as part of your training plan, not something separate from it.
One of the most common questions I hear is: "What should I eat before a triathlon or long training session?"
The answer depends on how long and how hard you're planning to train.
For shorter, low-intensity sessions, you may not need much at all. For longer rides, brick workouts, or race simulations, your body will perform far better with adequate carbohydrate stores. Aim to eat a meal containing carbohydrates for endurance athletes around two to three hours before training.
Porridge with banana and honey.
Toast with peanut butter.
Rice with eggs.
Yogurt with fruit and granola.
If you're training early in the morning and don't have time for a full meal, a banana, a slice of toast, or a sports drink can provide enough energy to get started comfortably.
For sessions lasting less than 60 minutes, water is usually sufficient.
Once you're training beyond 60 to 90 minutes, particularly on the bike, you'll benefit from additional carbohydrates and fluids. This becomes especially important during demanding sessions like Sweet Spot Training, where consistent fuelling helps maintain power output and improves workout quality.
Sports drinks.
Energy gels.
Bananas.
Energy chews.
Rice cakes.
Low-fiber energy bars.
The exact amount you'll need varies depending on your body size, training intensity and the weather.
The most important rule? Practice your triathlon race nutrition during training. Race day should never be the first time you try a new gel, drink mix or nutrition strategy.
Recovery starts as soon as your session finishes. One of the biggest priorities is replacing the carbohydrates you've used while also giving your muscles the protein they need to repair and adapt.
Good recovery nutrition doesn't need to be complicated.
A quality source of protein.
Carbohydrates to replenish glycogen.
Plenty of fluids.
Electrolytes if you've been sweating heavily
Some excellent recovery meals include grilled chicken with rice, eggs on toast, Greek yogurt with fruit, or a smoothie containing fruit, milk, and protein.
After particularly demanding sessions or races, many athletes also combine good nutrition with cold therapy to help manage soreness and kick-start their recovery routine.
Recovery isn't just about what you eat. Sleep, hydration, and using the right recovery tools can all help you feel fresher for your next session. Explore our Recovery Range to support your recovery after hard training and race day.
Good nutrition is only one part of the recovery equation. Our complete Triathlon Recovery guide covers the other habits that help you recover faster, reduce soreness, and arrive fresh for your next session.
Many athletes focus entirely on food while overlooking hydration. In reality, even mild dehydration can reduce endurance performance, increase perceived effort, and slow recovery.
That's why hydration for triathletes should become part of your daily routine, not just something you think about during races. Long rides, brick sessions, and summer training often require additional electrolytes for triathlon to replace the sodium and minerals lost through sweat.
Rather than waiting until you're thirsty, develop the habit of drinking consistently throughout the day and adjusting your intake based on the weather and training duration. On long flights, after races or during travel to events, many triathletes also wear Compression Socks to improve comfort and support recovery between training sessions.
If you're regularly training through the summer, hydration becomes even more important. Our guide to Training in the Heat explains how to adjust your pacing, hydration strategy and recovery when temperatures rise.
After coaching athletes for decades, I continue to see the same mistakes repeated. The good news is that they're all easy to avoid.
Many triathletes underestimate how much energy they actually use, particularly during heavy training blocks.
If you've never used a particular gel or sports drink in training, race day isn't the time to experiment.
Dehydration can gradually creep up without obvious warning signs, particularly during hot weather.
The sooner you begin refueling after a hard session, the better prepared you'll be for your next workout.
You don't need a cupboard full of supplements to become a better triathlete. Simple, nutritious food remains the foundation of every successful triathlon nutrition plan.
Not necessarily. Easy recovery sessions may not require additional fuel, while longer or higher-intensity workouts usually benefit from eating beforehand.
Choose familiar foods that are easy to digest and rich in carbohydrates, such as porridge, toast or a banana.
For longer races, consume carbohydrates and fluids regularly. Practice your what to eat during a triathlon strategy during training before race day.
Not always. Water is sufficient for many shorter sessions, while sports drinks become more useful during long or high-intensity training.
Most endurance athletes benefit from spreading protein intake across the day while including a serving after training to support recovery.
Energy gels can be very effective during long races or training sessions, but they're only one option. The best choice is whichever fuel your stomach tolerates well during training.
The best triathlon nutrition plan isn't the most complicated one. It's the one you'll consistently follow.
Eat enough to support your training, practice your race-day nutrition before race day, stay on top of hydration, and focus on simple, nutritious foods most of the time.
Pairing good nutrition with smart recovery habits can make an even bigger difference over a long training block. If you're wondering whether recovery technology is worth the investment, our guide to Do Compression Boots Work? looks at what the science actually says.
After more than two decades of coaching, I've found that athletes who fuel well don't just perform better; they recover faster, stay healthier, and enjoy the sport far more.
That's a competitive advantage no supplement can replace.
1. https://pubmed.ncbi.nlm.nih.gov/27886704/
2. https://www.tandfonline.com/doi/full/10.1080/02640414.2011.585473
3. https://www.ovid.com/jnls/acsm-msse/abstract/10.1249/mss.0b013e31802ca597~exercise-a
Honestly, no. Thousands of first-timers finish their debut race in a swimsuit, tri shorts, or whatever athletic gear they already own, and tri shorts are a genuinely good call for a sprint or shorter distance. Most experienced triathletes end up buying a tri suit anyway, less for speed and more because it removes the hassle: one outfit for the swim, bike, and run means no stopping to change and far less chafing over a long day.
Yes, plenty of first-timers do, especially over a sprint distance. The catch is bike shorts use a thick chamois built for cycling only, so it gets heavy and uncomfortable once you're running. A tri suit solves that with one chamois designed for all three legs.
Tri shorts cover just your bottom half; a tri suit is a one or two-piece covering the whole body for swim, bike, and run. Both use the same triathlon-specific chamois, but a full suit adds compression and aerodynamics through the torso, which matters more as the race gets longer. Our Elite, Pro, and AG suits sit at different points on that comfort-versus-performance scale depending on what you're racing.
Nothing extra for most of it. It's built to sit straight against the skin, with the chamois doing the padding and support work that underwear or shorts would normally handle. Women may still want a sports bra underneath since a tri suit isn't built with one in, but skip anything else, extra layers just add bulk and chafing risk.
No. The chamois pad is placed for triathlon-specific movement, and underwear underneath shifts that padding and adds friction. Wear it as designed, straight against the skin.
