Energy for Open Water Swimming

Open water requires a simple and tested energy plan, because conditions, logistics, and stomach comfort can vary along the way.

• On sessions under around 60 minutes, a regular meal before the start and fluids as needed may be enough for many.
• For longer sessions, around 30 to 60 grams of carbohydrate per hour can be a practical starting point that should be adjusted individually.
• Energy during the swim should be planned around safe options such as a feed zone, support boat, beach loop, aid station, or transition.
• Test taste, timing, concentration, packaging, and stomach comfort in training before using the plan for competition.

Open water is an endurance discipline where conditions can vary along the way. There is no wall to turn at, but there are waves, temperature, direction, other swimmers, and a body that has to work over time.

That is why it can be an advantage to have an energy plan you have tested in advance. The plan does not need to be complicated, but it should match your distance, your stomach, and the places where you can realistically get fluids and carbohydrate along the way.

Why energy for open water requires a plan

In open water, the effort is rarely completely steady. You need to sight, maintain rhythm in the waves, perhaps swim in a wetsuit, and adapt to the temperature. This can make energy needs more individual than in the pool.

On shorter swims under around 60 minutes, many people can manage with a regular meal before the start and fluids as needed. When the swim becomes longer, more intense, or is part of a triathlon, carbohydrate, fluids, and timing can become more relevant.

A practical starting point for longer endurance training can be around 30 to 60 grams of carbohydrate per hour. This is not a fixed rule for everyone, but a range you can work from and adjust according to duration, intensity, temperature, and stomach comfort.

The most important thing is to plan energy and fluids before you are in the situation. In open water, it is often easier to follow a simple plan than to improvise along the way.

Before the swim: start with energy in your body

The goal before open water is simple: You should stand at the water’s edge with an amount of food and fluid that suits you, without your stomach feeling heavy.

For many, a carbohydrate-rich meal 2 to 3 hours before the start works well. This could be oats, bread, rice, pasta, or other food you know you tolerate. Stick to what you know. Race day is rarely the best time to test a new breakfast.

If there is a long time between the meal and the start, a smaller carbohydrate intake 15 to 30 minutes beforehand may be relevant. This could be a sports drink, a gel, or a light snack. An energy snack before swimming can be practical if you want something easy to bring in your bag and quickly get a little carbohydrate before the start.

Think especially about your stomach. When you swim, your body is horizontal, your heart rate can be high, and your breathing needs to work well. That is why your energy should be tested in advance.

During the swim: keep your intake simple and safe

The big difference between open water and other endurance sports is logistics. On the bike, you can reach down for a bottle. On a run, you can take a gel from your belt. In the water, intake needs to be planned more carefully.

That is why your energy plan should be based on the places where you can actually get energy:

For longer sessions and races, liquid energy can be a practical solution because it can be consumed quickly. A bottle with energy powder for open water can be used before the start, at an aid station, or after the swim, depending on the format. Sports drink can also make it easier to spread carbohydrate across smaller intakes instead of taking it all at once.

In races where you can get energy in transition or from a helper, energy gels for racing can be practical because they take up little space and are quick to consume. Some prefer energy chews as an alternative to gels, especially if they want to dose carbohydrate in smaller bites over time.

Regardless of format, one rule applies: Energy should only be consumed when it can be done safely. It must not compromise breathing, sighting, or control in the water.

Fluids and electrolytes: you also sweat in water

It is easy to underestimate fluid needs when swimming in open water. You can still sweat, especially in a wetsuit, at high intensity, on warm days, or during longer training sessions.

At the same time, more fluid is not automatically better. The goal is not to drink as much as possible. The goal is to drink according to the conditions and your own experience.

Electrolytes may be relevant on long training days, in warm conditions, or if you know you sweat a lot. They can be part of the fluid plan, but they do not replace carbohydrate as an energy source. If you want to work more systematically with fluids, electrolytes for swimming may be relevant to test before or after sessions where fluid intake is especially important.

Also be aware of caffeine. Some adults use caffeine as part of their race strategy, while others experience restlessness, stomach discomfort, or sleep disturbances. Test it in training, and do not use it for the first time on race day.

Example energy plan for open water

Your plan should match the distance, conditions, and access to energy. Always use the product’s nutrition declaration to calculate how much carbohydrate you get per hour.

A practical starting point can be:

Small, regular intakes are often easier to manage than large amounts at once. This applies both to the stomach and to logistics in open water.

After the swim: get your body back on track

When you get out of the water, you may mostly be thinking about a towel, warm clothes, and getting home. After long or hard sessions, however, it may be relevant to have a simple routine for food and fluids.

Carbohydrate and protein can be part of your diet after training, especially if you train several times a week, have another session the same day, or combine swimming with cycling and running. Protein contributes to the maintenance of muscle mass.

A simple routine works well for many:

• Get warm.
• Drink a little.
• Get carbohydrate and protein in.
• Eat a regular meal when you can.

If your appetite is not at its best right after training, PurePower’s range for recovery after swimming can be a practical solution.

Test your energy plan before it matters

The best energy plan is typically the one you have already used in training.

Open water places demands that are difficult to assess on paper. Cold hands. Waves. Wetsuit. High heart rate. Nerves. Limited time at the feed zone. Your plan should be able to work under all of these conditions.

Therefore, test taste, concentration, timing, packaging, and stomach comfort under conditions that resemble your competition. Start simple. Build gradually. Adjust based on experience.

Then you do not just have products with you. You have a plan that has been tested in practice and adapted to your needs in open water.