You track your sets, your reps and your protein. Hydration often gets left to whatever's in the bottle you grabbed on the way out. But how well hydrated you are can change how a session feels and how you feel for the rest of the day.
Here's a straightforward gym hydration guide for weights, HIIT, spin and group classes.
Why hydration matters in the gym
Being even a little dehydrated can make training feel harder than it should. Gyms can also be warm, especially packed group classes, functional training floors and spin studios, so you can sweat more than you think.
Before your workout
- Arrive hydrated. Drink regularly through the day rather than chugging right before you train.
- Have a drink one to two hours before. Water is fine. If you train early, a glass of water when you wake up helps.
- Consider electrolytes for big sessions. If you're heading into a long, sweaty session, or training twice in a day, starting with some sodium is worth considering.
During your workout
- Keep a bottle close and sip between sets or rounds.
- Water covers most sessions under an hour.
- Longer or hotter sessions are where electrolytes are worth thinking about, especially HIIT, circuits and classes where you're drenched by the end.
After your workout
After training, your goal is to replace the fluid and electrolytes you lost.
- Rehydrate in the first hour. Keep sipping rather than drinking it all at once.
- Add electrolytes after sweaty sessions. Sodium helps your body hold on to fluid.
- Eat a proper meal with protein and carbohydrate.
A cold Uthrive is an easy post-gym habit. It's lightly sparkling, low sugar with no added sugar, with real salt from Lake Deborah and real fruit. No powder, no shaker, just crack it open. Our piece on hydration habits for the hour after training has more ideas.
Hydration by workout type
Strength and weights
Usually lower sweat rate, but long sessions add up. Water during, and a drink with electrolytes after a big session, works well.
HIIT and circuits
High sweat in a short time. Electrolytes after the session are worth it, especially in summer.
Spin and group classes
Warm rooms, lots of sweat. Bring a full bottle and rehydrate properly afterwards.
Hybrid and HYROX training
Long, mixed sessions that combine running and stations. Plan your fluids ahead. See our HYROX race day hydration guide.
Pilates and yoga
Especially hot formats. Our guide to electrolytes for Pilates covers it.
Simple gym hydration habits
- Fill your bottle before you leave home.
- Drink a glass of water when you wake up.
- Keep electrolytes for your sweatiest sessions and hot days.
- Check your urine colour: pale straw is the aim.
- Watch your pre-workout and coffee. They don't replace fluid.
Frequently asked questions
Do I need electrolytes for the gym?
Not for every session. They're most useful for long, hot or very sweaty workouts, or when you're training more than once a day.
Is water enough for weight training?
For most weights sessions, yes. After a long or sweaty session, a drink with electrolytes can help you rehydrate.
Should I drink electrolytes before or after a workout?
Both can work. After a sweaty session is the most common time. See the best time to drink electrolytes.
Is a sparkling drink okay after the gym?
Yes. Many people find a lightly sparkling drink more refreshing after training. More in sparkling electrolyte drinks.
Does Uthrive have artificial sweeteners?
No. Read electrolyte drinks without artificial sweeteners.
Shop Passionfruit, Orange, Pineapple or a mixed box.
General information only, not medical advice. If you have a health condition, talk to your doctor about your hydration needs.
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