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How to Nail Your Marathon Hydration Plan for Race Day

Cold, Covid & Flu· 28 October 2026
How to Nail Your Marathon Hydration Plan for Race Day

Understanding Your Hydration Needs

So, you’re gearing up for a marathon? Brilliant! But hold on—before you lace up those trainers, let’s chat about hydration. Nothing spoils a race quite like feeling parched or, worse, overhydrated. Dietitians recommend tailoring your fluid intake to fit your body and needs, which might be more art than science.

Pre-Race Hydration: The Night Before

Your hydration strategy should start long before the starting gun fires. Aim to drink enough water in the days leading up to the marathon. A good rule of thumb is to sip on water throughout the day. By the night before the race, you should feel well-hydrated but not like a bloated balloon.

What to Drink on Race Day

On the morning of the marathon, an electrolyte drink can be your best mate. Look for low-sugar options that provide sodium and potassium—these are the key players in keeping your muscles firing on all cylinders. You don’t want your body cramping mid-race!

During the Race: Sip Smart

Once you’re on the course, it’s vital to remember that hydration isn’t just about guzzling water. Ideally, you should aim to drink around 500-700 ml of fluid per hour, depending on your sweat rate. Here’s how to break it down:

  • Water Stations: Use these strategically—take a sip every 15-20 minutes.
  • Sports Drinks: Go for a mix of water and a sports drink to keep electrolytes balanced.
  • Energy Gels: Pair these with a small sip of water to help digest them better.

What to Avoid

As tempting as it might be to experiment, race day isn’t the time to try new drinks. Avoid heavy sugary drinks that can lead to a sugar crash. Plus, steer clear of caffeine unless you’ve trained your body to handle it.

Post-Race Hydration

Once you cross that finish line, don’t forget to rehydrate! Your body will need to recover, so opt for a mix of water and electrolyte drinks to replenish what you’ve lost. A recovery shake can also be ideal for refuelling muscle glycogen.

Your Personal Hydration Plan

Everyone’s needs are different, so it’s wise to test your hydration plan during training runs leading up to the big day. And remember, listen to your body: it knows best. If you’re feeling thirsty, drink up!

So, how’s your hydration plan looking? Got any tried-and-true tips? Let’s hear your strategies below!

Category: Cold, Covid & Flu