How to hydrate for a marathon or 10K in Kerala's heat: before, during and after
Start the evening before and drink steadily, rather than gulping a lot on race morning. On the course, take a few sips at each water point, including the early ones, even before you feel thirsty. After the finish, keep drinking over the next few hours. Needs differ from person to person, so follow the organisers' and your doctor's guidance.
General information, not medical advice; follow the organisers' and your doctor's guidance.
Kerala mornings are often warm and humid, even before sunrise. You sweat steadily on a long run, and you can lose water well before you feel thirsty. The habits below are general and simple. They are not a plan for any one person, and how much you need depends on your body, your pace and the weather.
At a glance
| When | What helps |
|---|---|
| The day and evening before | Drink steadily through the day and evening. Don't try to catch up at the start line. |
| Race morning | A normal drink when you wake. No need to force large amounts. |
| On the course | A few sips at each water point. Don't skip the early ones. |
| After the finish | Keep drinking over the next few hours, not just at the finish line. |
The day and evening before
- Drink steadily through the day and evening instead of a lot at once late at night.
- Eat your usual meals. The night before a race is not the time to try new food.
- Lay out your kit early so you can sleep on time.
Race morning and pre-dawn starts
Have a normal drink when you wake, but don't force large amounts. Early starts are common in Kerala to beat the heat: at Rubber City Run 2026 the full marathon starts at 3:30 AM. Cooler air can make you feel less thirsty, but you are still losing water, so the early water points matter.
During the run
- Sip, don't gulp. A few mouthfuls at each point usually sits better than a full cup at one.
- Don't skip the early points, even if you feel fine.
- Slow down or walk through a station if that helps you drink.
- Know where the points are before you start.
See all 13 Rubber City Run hydration points, with map links →
After you finish
- Keep drinking over the next few hours, not all at once.
- Eat a normal meal and rest in the shade.
- If you feel dizzy, confused or unwell during or after the run, stop and ask the nearest volunteer or the medical team for help.
Read: Rubber City Run 2026 timings and race-day checklist →
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Frequently asked questions
How much water should I drink before a marathon?
There is no single amount that suits everyone; it depends on your size, pace, the heat and how much you sweat. Drink steadily through the day and evening before, and avoid forcing large amounts on race morning. Your doctor can advise for your own case.
Can you drink too much water during a race?
Yes, drinking far more than your body needs can also be harmful. Don't force fluids. Drink at the water points as you need to, and follow the organisers' and your doctor's guidance.
Should I drink water or an electrolyte drink?
It depends on the distance, the weather and the person. For advice on electrolyte drinks, ask your doctor or the race medical team.
What changes in hot, humid weather?
You usually sweat more, so start the day well hydrated, use every water point, ease your pace if you need to, and keep drinking after the finish. Rest in the shade afterwards.
Does a pre-dawn start mean I need less water?
Not necessarily. Cool air can make you feel less thirsty, but you still lose water as you run. Use the early water points even if you feel fine.
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