Electrolytes for the Gym: When to Drink Them Before, During and After a Workout

"Electrolytes for gym" and "when to drink electrolytes, before or after workout" are two of the most common electrolyte searches in India. The short answer: it depends on how long you train, how hot it is and how much you sweat. Here's the timeline the sports-science position stands recommend, and when an electrolyte drink is worth it.

Do you need electrolytes for the gym?

For a typical 45–60 minute strength session in an air-conditioned gym, usually not. Water to thirst and your next meal replace what you lose. Electrolytes become useful when:

• The session runs past about 60 minutes, or you train twice a day
• You're doing HIIT, CrossFit-style circuits or sports in a hot gym, a turf or outdoors
• You sweat heavily or see salt marks on your T-shirt
• You're cutting weight or on a low-carb diet

Sweat rates in athletes average about 1.2 litres an hour but vary from about 0.3 to over 5,⁷ which is why both ACSM and the National Athletic Trainers' Association say to personalise your plan.^1,2

When to drink: before, during and after

Before (pre-workout hydration)

About four hours before training, drink roughly 5–7 ml per kg of body weight: 350–490 ml for a 70 kg person. If you're not peeing, or your urine is dark, add another 3–5 ml/kg about two hours out. Having some sodium (a salty snack or an electrolyte drink) helps you hold on to it.¹

During (intra-workout)

The aim is to avoid losing more than about 2% of body weight, without overdrinking.¹ ACSM suggests 400–800 ml an hour as a starting range, adjusted for your sweat rate and the heat. Exercise physiologist Dr Andy Galpin's rule of thumb on the Huberman Lab podcast lands in the same place: body weight in pounds ÷ 30 = ounces every 15–20 minutes.⁵

Don't stress over the exact number in short sessions. A meta-analysis of cycling time trials found that drinking to thirst performed as well as or better than following a fixed schedule.⁶

After (post-workout recovery)

To fully rehydrate, you need to drink more than you lost, and it needs sodium. In a classic study, drinks equal to 150% of sweat loss restored fluid balance far better when they contained more sodium. With low-sodium drinks, most of the extra volume just became urine.^3,4 A practical target is 1.25–1.5 litres for every kg lost, spread over a few hours.

A meal with salt does much of this job, as does milk. An electrolyte drink is handy when you need to train again the same day.

Electrolytes vs pre-workout, creatine and BCAAs

• Electrolytes vs pre-workout: pre-workouts are mostly caffeine for alertness. Electrolytes replace sweat. They do different jobs, and many pre-workouts contain little or no sodium.
• Electrolytes vs creatine: creatine is for strength and power over weeks; it doesn't hydrate you. You can take both.
• Electrolytes vs BCAAs: BCAAs are amino acids. If you already eat enough protein they add little, and they don't replace sodium.

Cricket, football and other team sports

Team sports in Indian heat combine long durations with bursts of high intensity, so sweat losses add up. That's the case for electrolytes. Use drinks breaks and innings breaks to sip, aim to stay within about 2% of starting body weight,¹ and plan carbohydrate too: for 1–2.5 hours of play, sports dietitians suggest 30–60 g an hour.⁸

How we'd use Flow around training

• Short session, cool gym: water. Save the sachet.
• Long or hot session: one sachet in 500 ml, sipped from halfway through.
• Two sessions in a day, or a heavy sweat: one sachet with water afterwards, plus a proper meal.

For long runs and races, see our marathon hydration plan. If you're cramping, see what really causes cramps.