Before, During, After: The Hydration Guide for Every Workout | REVIVR

Hydration is one of the most underestimated performance variables in training. Most gym-goers focus on protein intake, sleep, and programming , but the timing and quality of what you drink around your workouts has a direct impact on how hard you can push, how long you can sustain effort, and how quickly you recover. Here's a complete hydration guide for gym training, broken into the three phases that matter most.

Before Your Workout: Pre-Load Your Electrolytes

Starting a workout already dehydrated is one of the most common performance mistakes. Even mild dehydration of 1-2% body weight reduces strength output, impairs endurance, and increases perceived effort , meaning the same session feels harder than it should.

The goal before training is to arrive at your session fully hydrated and with adequate electrolyte levels. This means drinking consistently throughout the day, not just chugging water in the car on the way to the gym.

In the 30-60 minutes before training, having an electrolyte drink primes your system. Sodium encourages your tissues to absorb and retain fluids more effectively, meaning the water you drink actually goes to work rather than passing straight through. Potassium and magnesium support the nerve and muscle function you're about to demand.

During Your Workout: Replace What You Lose

During exercise, you lose water and electrolytes through sweat. The rate varies significantly depending on exercise intensity, temperature, and individual physiology , but most people lose between 0.5 and 2 litres of sweat per hour during moderate to intense training.

For sessions under 45 minutes, consistent water intake is usually sufficient. For sessions over an hour, or any training in warm conditions, electrolyte replenishment during the session helps maintain performance in the later stages.

Sip rather than gulp. Large amounts of plain water consumed quickly during exercise can cause bloating and discomfort. A steady intake of 150-250ml every 15-20 minutes is a practical guideline for most training contexts.

After Your Workout: Rebuild and Recover

Post-workout is when electrolytes arguably matter most. After training, your glycogen stores are depleted, your muscle fibres have microscopic tears that need repair, and your electrolyte levels are lower than when you started. This is the window where what you consume directly influences how recovered you'll feel by your next session.

Rehydrating with electrolytes after training , rather than plain water , accelerates the recovery of fluid balance. Sodium helps retain the fluids you're taking in rather than excreting them immediately. Magnesium supports muscle relaxation and reduces the likelihood of post-workout cramping or stiffness.

Pair your post-workout electrolyte drink with a protein source for optimal recovery. Muscle protein synthesis requires both amino acids and adequate hydration to proceed efficiently.

Common Hydration Mistakes to Avoid

The Simple Rule

Consistent, electrolyte-supported hydration before, during, and after training outperforms any reactive approach. Build it into your routine the same way you would your warm-up or cool-down, and your performance and recovery will reflect it.

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