Electrolytes Explained: Why Water Alone Isn't Always Enough

What are electrolytes, exactly?

Sodium, potassium, chloride, magnesium and calcium are among the electrolytes involved in normal fluid balance and muscle and nerve function. They come from food and drinks, not just branded sports products. Sodium deserves particular attention during exercise in the heat because sweat contains sodium as well as water. Sweat rates and salt losses differ widely between people and conditions, so a single fixed bottle rule is a poor fit for everyone.

Sweating cools the body. It also changes the body's fluid balance. In humid Sri Lankan weather sweat may not evaporate as readily, and a session can feel harder to manage even when the pace looks moderate. That is a reason to plan opportunities to drink and cool down, not a reason to assume every headache or cramp is an electrolyte deficiency.

When might water alone not be enough?

Think in terms of exposure rather than a magic minute mark. A brief indoor gym session with normal meals and water may need nothing more. A long run in the heat, a rugby training block, rowing on a humid morning or outdoor cricket over many hours presents a different challenge. So does a tournament with repeated badminton or squash matches and limited recovery time. In each case, access to fluids, food, shade and breaks matters.

Plain water does not replace sodium lost in sweat. But electrolyte products do not automatically solve inadequate drinking, excessive heat exposure or insufficient food. Overdrinking large amounts of plain water during prolonged activity can also be unsafe. Drink according to conditions and thirst, take reasonable breaks and seek individual guidance for particularly long events or heavy sweat losses.

Before, during and after sport

Before: Begin a session normally hydrated, with meals and drinks appropriate to the day. If heading straight from a Colombo office to an evening run or racket-sport match, pack a bottle and a snack rather than relying on the venue to have both. There is no benefit in forcing large volumes just before play.

During: Use natural breaks to drink. In cricket, rugby and running, access and intensity vary; plan around the actual fixture rather than copying a teammate's routine. For pickleball and padel, repeated games can turn a seemingly brief match into a long court session. If you are sweating heavily or playing for hours, an electrolyte drink may be useful, but plan fuel separately if energy demands are high.

After: Drink, eat and cool down. A regular meal contributes fluid, sodium and carbohydrate. If you have another match soon, the gap between games matters: bring food you tolerate, refill your bottle and find shade. Avoid treating the colour of one urine sample or one cramp as a diagnosis.

Choose the plan, not just the product

Tablets are convenient when you have water and a suitable bottle. They are not required for every workout, and the appropriate drink varies with the duration, heat and intensity of exercise. If you are doing extended endurance work, compare an electrolyte-only option with a drink that also provides carbohydrate. For sport-specific reading, see our planned guides to SiS GO Hydro tablets, pickleball hydration and padel hydration. Those links will only be public when their draft articles are published.