Hydration during training: how much and when to drink water

Water is your first weapon

You might have the best technique in the room, the sharpest footwork in the gym, and cardio that seems endless — but if you show up to training already dehydrated, your body will betray you before you reach the halfway point of the session. Hydration isn't a fine detail of sports nutrition reserved for elite athletes. It's an absolute fundamental, and at BadAzz Station we treat the fundamentals with just as much respect as the most advanced techniques.

In this article we explain how dehydration works in the context of martial arts, how much you should drink and when — before, during and after training. Whatever your discipline, these rules apply to you.

What dehydration does to your performance

The human body is made up of around 60% water. Muscles alone can reach 75%. When we start sweating during an intense Muay Thai, MMA or Kickboxing session, that balance starts to break down quickly.

A loss of just 2% of body weight in fluids is enough to measurably degrade performance. We're talking about:

• Reduced strength and muscular power;
• Slower reaction time — critical in combat;
• Decreased concentration and decision-making;
• Muscle cramps and a higher risk of injury;
• Slower recovery between rounds and between sessions.

In combat sports, where fractions of a second separate a well-timed counter from eating a clean shot, losing mental clarity through lack of water is a mistake you pay for dearly. In Wrestling or Luta Livre training, where grip strength and explosiveness are everything, the muscular breakdown caused by dehydration is even more obvious.

Before training: arrive hydrated

The biggest mistake we see day in, day out is the athlete who arrives at the gym already thirsty. By that point, you're already in deficit. Hydration starts hours before you lace up your shoes.

Follow these general guidelines:

• 2 to 3 hours before training: drink around 500 ml of water (the equivalent of a standard bottle).
• 30 minutes before you start: drink another 200 to 300 ml to make sure your tissues are properly prepared.

The colour of your urine is the most practical indicator you have. Pale yellow, almost clear, means you're well hydrated. Dark yellow is a clear warning sign — drink up before you step on the mats.

Avoid excessive caffeine right before your session — it can have a mild diuretic effect and contribute to dehydration. A morning coffee won't hurt you, but four espressos aren't the ideal pre-training preparation.

During training: small sips, regular frequency

The temptation is to wait for a break before drinking. Don't do that. By the time thirst kicks in, the dehydration process is already underway. The right strategy is to drink proactively and regularly, even before you feel the need.

The guideline that works for most martial arts athletes:

• Around 150 to 250 ml every 15-20 minutes of active training;
• During very intense sessions or on hot days, increase to 250-300 ml in the same interval;
• Don't drink large amounts at once — a full stomach during sparring or a grappling sequence is uncomfortable and can cause nausea.

Small, frequent, controlled sips. It's simple, but it makes all the difference over a 60 or 90-minute session.

Water is, in most cases, sufficient for training sessions up to 60 minutes long. For longer or higher-intensity sessions — such as competition preparation — electrolytes (sodium, potassium, magnesium) start to matter, because sweat doesn't only remove water; it also flushes out the essential minerals your muscles rely on.

After training: replace what you lost

The session is over, but the hydration work isn't. Muscle recovery, protein synthesis and nutrient transport all depend on adequate fluid levels. Drinking only when you're thirsty after training isn't enough.

The most widely used practical rule in high-performance sport is straightforward: weigh yourself before and after training. Each kilogram lost corresponds to roughly one litre of fluid deficit. The goal is to replenish that amount gradually over the following hours.

• In the first two hours after training, drink at least 500 to 750 ml of water;
• Include water-rich foods in your post-training meal: fruit, vegetables, soups;
• If you sweated heavily, consider adding a pinch of salt to your water or opting for a natural isotonic drink (coconut water, for example).

Recovery starts with the water bottle, before you even think about your meal or your protein supplement.

Hydration and weight cutting: a necessary conversation

In the world of competitive martial arts, forced dehydration for weight cutting is a reality we can't ignore. Many athletes use saunas, training in rubber suits and fluid restriction to drop a weight class before the weigh-in.

At BadAzz Station, our position is clear: extreme weight cutting is dangerous and, in the long run, hurts both performance and health. Athletes who arrive at competition severely dehydrated have slower reaction times, reduced muscular strength and a higher risk of serious injury — including brain trauma, since the cerebrospinal fluid that protects the brain also decreases with dehydration.

If you're preparing for a competition and need to manage your weight, talk to our team. There are progressive, safe weight management strategies that are far more effective than a last-minute drastic cut. You can reach us through our contact page or check our schedule to arrange a conversation with the coaches.

Hydration day to day: what you do outside the gym counts too

The hydration level you bring to training depends on what you've been doing in the hours and days before. An athlete who drinks little water through the week and tries to "make up for it" on training day is working against themselves.

The general recommendation for active adults sits between 2.5 and 3.5 litres of water per day, including the water found in food. For martial artists training at high intensity, that figure can be higher — especially in summer or during competition preparation periods.

Some simple habits that help:

• Always keep a water bottle visible on your desk or at home;
• Drink a large glass of water as soon as you wake up — the body always wakes up in slight deficit;
• Link hydration to fixed points in the day (meals, work breaks, before bed);
• Use a water intake tracking app if memory is the issue.

You don't need to do anything extraordinary. You need to be consistent — just like everything we do in training.

Frequently asked questions about hydration during training

Can I replace water with sports drinks during training?

For most training sessions under 60 minutes, water is sufficient. Electrolyte sports drinks make sense for longer, more intense sessions or in high-heat conditions where mineral loss is significant. But watch the sugar content — many commercial drinks have high concentrations that can cause gastrointestinal discomfort during intense effort.

Should I drink water during sparring?

Yes, during the breaks between rounds. Small sips (100-150 ml) are enough to maintain hydration without filling your stomach. Avoid drinking large amounts at once during intense work sequences.

Does caffeine before training dehydrate you?

The diuretic effect of caffeine is real, but moderate at normal doses. One or two caffeinated drinks won't significantly compromise your hydration. The problem appears when caffeine is consumed in excess without compensating with water — which is common among people who live on energy drinks and espressos before training.

How do I know if I'm well hydrated before training?

Urine colour is the best practical indicator. Pale yellow to clear — you're good to go. Dark yellow or amber — drink water before you step into the room. Beyond that, no headaches, no dry mouth and stable energy throughout the day are all positive signs of good hydration.

Which BadAzz Station classes demand the most attention to hydration?

All training sessions require good hydration, but those with the highest cardiovascular and contact intensity — such as Muay Thai, MMA and Kickboxing — produce a higher sweat rate. Wrestling and Luta Livre sessions are equally demanding due to their strength and endurance components. Check our pricing page to find out how to get started.