You start your session strong, but halfway through your workout, your pace drops: heavy legs, waning concentration, that feeling of an “empty tank.” Often, it’s not about fitness or willpower, but a variable that most of us underestimate: hydration. In this guide, we’ll explore why water (and more) makes a difference to your energy, how much to drink, and how to power through to the last rep.
Why Energy Drops Mid-Workout
When you exercise, you generate heat, and your body cools down by sweating. With sweat, you lose not just water, but also minerals (electrolytes) like sodium, potassium, and magnesium, which regulate muscle contraction and nerve impulse transmission. If you don’t replenish these fluids, blood volume decreases, making it harder for your heart to deliver oxygen to your muscles, and performance suffers.
The surprising fact: just a 1-2% dehydration of body weight — only 0.7-1.4 kg for a 70 kg person — can measurably reduce strength, endurance, and mental clarity. In practice, by the time you feel thirsty, you’re already behind: thirst is a late signal, not a reminder to be followed at the last minute.
How Much Water to Drink: Before, During, and After
There isn’t a magic number that fits everyone — it depends on duration, intensity, temperature, and how much you sweat — but these practical guidelines work in the vast majority of cases.
Before the Workout
- Drink about 400-600 ml of water in the 2-3 hours prior, so you start well-hydrated.
- Another sip (150-250 ml) 15-20 minutes before starting.
- Check the color of your urine: light straw yellow = hydration okay; dark = drink more.
During
- For sessions up to 60 minutes, water is usually sufficient: 150-250 ml every 15-20 minutes.
- Beyond 60 minutes or in hot and intense sweating conditions, electrolytes and a bit of carbohydrates are needed to maintain pace.
- Drink in small, regular sips, not all at once: avoid the feeling of a full stomach.
After
- Replenish 1.25-1.5 liters for every kilogram of weight lost during activity (weigh yourself before and after to understand how much you sweat).
- Combine water, minerals, and a source of protein/carbohydrates to aid recovery.
Not Just Water: The Role of Electrolytes and Carbohydrates
Replenishing only water after significant sweating can actually dilute salts in the blood too much. Electrolytes — especially sodium and potassium — help retain fluids and maintain muscle function, reducing the risk of cramps during long sessions.
If you train often or sweat a lot, consider a targeted intake of minerals: we discuss this in our Mineral Complex Plus guide, useful for understanding how to integrate them into your daily routine.
Carbohydrates come into play during sessions longer than an hour or of high intensity: a small amount of sugar in the drink helps keep blood sugar stable and delays fatigue. This is the principle behind isotonic drinks, designed to replenish water, salts, and a portion of energy while you move.
Signs of Dehydration Not to Ignore
- Intense thirst and dry mouth
- Drop in strength and “wooden legs” halfway through the session
- Muscle cramps
- Headaches or dizziness
- Faster heartbeat than usual for the same effort
- Scant, dark urine
If these occur during your workout, slow down, cool off, and gradually replenish fluids and electrolytes. Prevention is much easier than catching up.
Practical Strategy to Maintain Energy Levels
- Arrive already hydrated: hydration starts hours before, not when you enter the gym.
- Keep your water bottle handy and drink at regular intervals, without waiting for thirst.
- For long or intense sessions, choose a drink with electrolytes and a portion of carbohydrates.
- Adjust quantities according to the climate: in heat and humidity, you sweat more and need to drink more.
- Also pay attention to your overall nutrition: energy and recovery start at the table.
Energy, after all, is built throughout the day: a well-structured protein breakfast and a gradual path to regain fitness make just as much difference as your water bottle.
CR7 Drive: Hydration and Flavor During Sports
When water alone isn’t enough, an isotonic drink helps you replenish effectively. CR7 Drive from Herbalife is formulated specifically for physical activity: it provides fluids, electrolytes, and a portion of carbohydrates to support hydration while you train, with a light and refreshing acai berry flavor that encourages regular drinking — an important detail, because the best drink is the one you actually consume.
- Ideal for longer or intense sessions and on hot days.
- It prepares in seconds by dissolving a sachet in water.
- Convenient to take to the gym, on the bike, or during a run.
Incorporate it into your hydration routine alongside water and good nutrition: it’s the simplest way to ensure you don’t leave energy on the table when you need it most.
Water or Isotonic Drink: When to Choose What
The practical rule is simple. For short and low-intensity activities — a brisk walk, a 30-40 minute session — water is more than sufficient. However, when the workout exceeds an hour, is intense, or takes place in heat and heavy sweating, the isotonic drink comes into play: it replenishes water, electrolytes, and a portion of carbohydrates, exactly what you lose and consume when you push yourself. It’s not a competition to see who drinks the most: it’s about giving your body the right thing at the right time.
Frequently Asked Questions About Hydration in Sports
Can I just drink water during my workout?
For sessions up to about an hour, yes: water covers the needs well. Beyond an hour, or when sweating a lot, adding electrolytes and a small amount of carbohydrates helps maintain performance and concentration and is useful in preventing cramps.
How much should I drink during an intense session?
A good reference is 150-250 ml every 15-20 minutes, adjusting based on how much you sweat and the climate. The most precise way to gauge is to weigh yourself before and after the workout: the difference is the fluid to replenish.
Can drinking too much water be a problem?
Yes, although it’s rare: consuming large amounts of just water in a short time can excessively dilute sodium in the blood. For this reason, in long activities, it’s better to combine minerals instead of just focusing on volume.
How do I know if I’m well-hydrated?
The simplest method is to observe the color of your urine: a light straw yellow indicates good hydration, while a dark color signals that it’s time to drink more. Intense thirst and a dry mouth are already signs of delay.
