Electrolytes vs Water for Long Runs: What Every Marathon Runner Needs to Know Before Race Day

For a short, easy run, water may be all you need but as your distance, workout duration and sweat rate increase, hydration for runners becomes more nuanced. During prolonged exercise, you lose both fluids and electrolytes through sweat, so marathon runners need to think beyond simply drinking more water.

The real question isn't “water or electrolytes?” It's “when do you need which?”

Is Water Enough for Long Runs?

For shorter or lower-intensity runs, plain water can generally cover your hydration needs but during longer runs, especially when you're sweating heavily or running in hot and humid conditions - your electrolyte losses become more relevant.

The American College of Sports Medicine notes that endurance athletes exercising for extended periods, particularly in the heat, need to pay attention to individual fluid and electrolyte requirements.

So, don't automatically replace every bottle of water with an electrolyte drink. Your distance, sweat rate, pace and weather should guide your strategy.

When Should Runners Consider Electrolytes?

Electrolytes can become particularly useful when you're:

• Running for extended periods
  
• Sweating heavily
  
• Training in hot or humid weather
  
• Preparing for a marathon or half marathon
  
• Losing noticeable amounts of salt through sweat

Sodium is one of the main electrolytes lost through sweat. During prolonged exercise, replacing some of those losses can be part of an effective marathon hydration strategy. World Athletics also recommends practising drinking during training rather than experimenting during competition.

Water vs Electrolytes: What's the Difference?

Neither is automatically “better.” They serve different purposes.

And there's an important caveat: drinking excessive amounts of plain water or any fluid can be dangerous. Exercise-associated hyponatremia is associated with overdrinking, so marathoners shouldn't treat hydration as a “drink as much as possible” challenge.

What About Electrolytes During a Marathon?

A marathon can take anywhere from a little over two hours to several hours depending on the runner. That makes hydration and fueling something you should plan and practise, rather than improvise.

Your race-day strategy could include water at aid stations and electrolytes where appropriate, depending on your individual needs and what you've already tested during long runs.

And remember: electrolytes are not a substitute for carbohydrate fuel. If you're running for several hours, your overall marathon nutrition plan may also need carbohydrates through food, gels or a suitable sports drink. World Athletics guidance treats hydration and carbohydrate fueling as separate but complementary parts of endurance preparation.

Where Does Drnksalts Fit In?

If you're looking for an electrolyte drink for runners without added sugar, Drnksalts Salts Hydrate can be incorporated into your training and hydration routine.

It provides sodium, potassium and magnesium, with zero added sugar, in convenient sachets that are easy to carry during long runs, workouts and races.

The important part is to test it before race day. Try it during progressively longer training runs and find a hydration routine that works comfortably for you.

How to Build Your Long-Run Hydration Strategy

Don't copy another runner's bottle count. Instead, pay attention to:

1. How much you sweat
   Some runners lose considerably more fluid than others.
   
   
2. How long you're running
   A 45-minute easy run and a three-hour marathon training run have very different hydration demands.
   
   
3. The weather
   Heat and humidity can increase sweat losses.
   
   
4. Your stomach tolerance
   Your hydration strategy should feel comfortable while you're running.
   
   
5. Your race plan
   Practise exactly what you'll use during your target marathon.

World Athletics specifically recommends practising drinking during training and using the same drinks during training and racing.

The Bottom Line

Water is essential, but longer runs may require more than water alone. If you're running for an extended period or sweating heavily, electrolytes can help you replace some of the minerals lost through sweat. The right approach depends on your individual needs, not a universal formula.

Before race day, practise your hydration, electrolytes and fueling strategy during training. With sodium, potassium and magnesium, zero added sugar and convenient sachets, Drnksalts Salts Hydrate can be a simple addition to your long-run hydration routine.

Know your run. Know your hydration. Run stronger with Drnksalts.

FAQs

Are electrolytes better than water for running?
Not always. Water is suitable for many shorter runs, while electrolytes can be useful during longer or sweat-heavy sessions.

How long should you run before taking electrolytes?
There isn't one universal time. Duration, sweat rate, intensity and weather all matter.

Should I drink water or electrolytes during a marathon?
Many marathoners use both. Your strategy should be based on your individual fluid and electrolyte needs and tested during training.

Can you drink too much water during a marathon?
Yes. Overdrinking can contribute to exercise-associated hyponatremia, so runners should avoid forcing excessive fluids.

Should I test electrolytes before race day?
Absolutely. Your long runs are the best opportunity to test your product, timing and quantity before race day.

Run Long. Hydrate Smart.

Long runs demand more than distance, they demand a smart hydration strategy. With sodium, potassium and magnesium, zero added sugar, and convenient sachets, Drnksalts Salts Hydrate makes it easy to include electrolyte hydration in your training and race-day routine.

Train smarter. Hydrate better. Run stronger with Drnksalts.