Drinking while running sounds simple to some, while others make a science out of it.
As is so often the case, the truth for most runners lies somewhere in the middle.

Especially during longer runs, long runs, or trail running, the topic of hydration becomes more complex. Drinking too little feels bad, while drinking too much can, in the worst-case scenario, even be dangerous (yes, really). Those who pay attention to this will run more relaxed, safely, and often more consistently.

Why hydration is so important when running

The body loses fluid when running, not only through sweating but also through breathing. The latter is especially true in the cold winter months. One point that is often underestimated when running in winter ... The longer the session lasts, the more relevant fluid loss becomes. Especially That's why hydration plays a crucial role in your long-run setup . If your fluid levels drop too low, not only will your performance suffer, but also your concentration.

But first, stay relaxed; not every deviation from the ideal state is immediately problematic. The body can cope with fluctuations – as long as you don't force it into extreme situations.

The most important tip of all

There are countless opinions, plans, and strategies regarding drinking.
Nevertheless, everything can be reduced to one simple principle:

If you are thirsty, drink.

It sounds trivial, but it's crucial. Thirst is a very reliable signal from the body. Those who learn to listen to it will automatically do many things right.

Rigid drinking schedules, on the other hand, are often problematic – especially if they lead to drinking more than the body actually needs.

Dehydration vs. Hyponatremia – an important difference

Most runners are familiar with dehydration. It's unpleasant, causes fatigue, and can impair performance. But only with very severe fluid loss does it have a significantly negative impact on the body.

Less well-known, but significantly more dangerous, is hyponatremia . In this condition, the sodium concentration in the blood drops, usually due to excessive fluid intake without sufficient electrolytes. The body is essentially "diluted".

Typical signs can include:

• swollen hands or feet
• malaise
• Confusion

In severe cases, this condition can become life-threatening. Therefore, it is important not to drink excessively, but to listen to your own thirst and to understand the importance of electrolyte balance.

What should you drink while running?

In most cases, the answer is simple: water .

For short to medium runs, plain water is perfectly sufficient. For very long runs, in high heat, or with heavy sweating, it can be beneficial to replenish electrolytes or a little salt to compensate for the loss.

Often, that's all that's needed. Isotonic drinks or special mixtures are not a must, but an option – depending on duration, intensity, and individual needs.

How much should you drink?

There is no general recommendation. Body weight, temperature, intensity, and duration all play a significant role.

A rough guideline is often given as 500–800 ml per hour , but even this is only a guideline. It's much more important to pay attention to your own signals and not try to plan every sip.

Most importantly:

• Drink plenty of fluids before the run; never start thirsty.
• Drink regularly in small sips
• Don't try to drink "in advance".

How should you drink while running?

Small sips are better than large amounts at once.
This is gentler on the stomach and ensures a consistent supply of nutrients.

Drinking while running is a skill that needs to be practiced. It feels strange at first, but your body adapts quickly. The more you practice, the more natural it becomes.

How do you carry fluids with you when running?

Drinking while running can initially be challenging in terms of coordination. A running vest with soft flasks and a bite valve is a great help here. Because the flasks are positioned at the front, all you have to do is tilt your mouth downwards and drink. You don't need to take the bottle out or unscrew a cap. It works just as easily with a hydration bladder with a hose and bite valve.

Which solution is right for you depends not only on the distance, but also on the rest of your setup. An overview of proven trail running equipment will help you make this decision.

For shorter runs, simply carrying a water bottle or using a running belt with a pocket for a soft flask will do. For longer distances, running vests are significantly more comfortable, as they distribute weight better and leave the arms free.

Regardless of the system, what is important is:

• Nothing should wobble.
• Access should be easy.
• Drinking shouldn't throw you off your rhythm.

What should you drink before running?

Don't start your run thirsty.
A glass of water before training is usually sufficient. Drinking too much before starting is just as bad as drinking too little – both can cause problems.

Hydration is individual

What works for others may not automatically work for you.
Therefore, the rule is: try it out, observe, adapt.

Test runs are the right place to try out fluid intake, drinks, and timing. In competition, you should stick to what you know works.

Conclusion: Drinking should support, not keep you occupied.

Hydration while running doesn't have to be a complicated science project.
Those who listen to their own thirst, drink regularly and avoid extremes are usually well supplied. For longer runs, it is helpful to drink fluids, for example with to carry a running vest close to the body and in a stable position, so that drinking becomes natural and doesn't stop you from running.

Drinking should help you run at a consistent pace –
not dominate your training.