Training through an Australian summer is a different game. Early sunrises, humid afternoons and 30 degree mornings all push your sweat rate up, which means your hydration plan needs to work harder too. Here's a practical approach for hot sessions, built on guidance from the Australian Institute of Sport (AIS).
Why heat changes your hydration needs
When it's hot, your body cools itself by sweating. The hotter and more humid it is, and the harder you work, the more you sweat. Sweat is mostly water, but it also carries sodium. Over a long or intense session, both add up.
Everyone sweats differently. Some people lose a lot of fluid, and some have "salty sweat" that leaves white marks on hats and shirts. The AIS lists high sweat rates, long sweating sessions and salty sweat as situations where replacing sodium, not just water, is worth considering.
A simple three-part plan for hot sessions
1. Before you train
Start hydrated. Drink regularly through the day before an afternoon session, and have a drink with your pre-training snack. The AIS notes that electrolytes can be useful before exercise in hot conditions, where large sweat losses can't practically be replaced during the session.
2. During training
Sip regularly rather than waiting until you're thirsty and then gulping. Keep your bottle where you can reach it, especially in group classes or outdoor sessions where breaks are short. For longer, sweatier sessions, water plus electrolytes helps replace some of the sodium you're losing.
3. After training
Weigh yourself before and after a hot session to get a rough idea of how much fluid you lost. The AIS suggests replacing roughly 1.2 to 1.5 times the estimated fluid deficit, within 2 to 4 hours after the activity. It links electrolyte replacement to rehydration after moderate to severe dehydration, giving the example of losses greater than 2% of body mass. Sodium plays a role in how your body holds on to the fluid you drink, and a proper meal afterwards helps too.
Don't overdo the water either
More isn't always better. The AIS points out that excessive fluid intake is the main cause of serious hyponatraemia (low blood sodium), and that adding sodium doesn't make overdrinking safe. Aim to replace what you lose, not to drink as much as you possibly can.
Practical tips for Australian summer training
- Train early or late. Avoid the hottest part of the day where you can.
- Dress for the heat. Light, breathable clothing and a hat for outdoor sessions.
- Ease in. The first hot weeks of the season can feel tougher. Build up gradually.
- Check your colour. Pale straw-coloured urine is a good sign. Dark yellow means drink more.
- Plan for big days. Events, long runs and HYROX-style sessions deserve a hydration plan, not a guess.
Know the warning signs
Headaches, dizziness, cramps, nausea and unusual fatigue can all be signs you're struggling in the heat. If you or a training partner feels confused or unwell, stop, get into the shade, cool down and seek medical help.
Where Uthrive fits
Uthrive is a lightly sparkling, ready to drink natural hydration drink in a 355mL can. The electrolytes come from certified organic Lake Deborah salt from Western Australia, with real fruit juice, natural flavour, no added sugar and nothing artificial. Choose from Passionfruit, Pineapple and Orange online, or find a stockist near you.
Not sure whether you need electrolytes or just water? Read Electrolytes vs Water, or check our pre and post training hydration guide.
Hydrated by Nature
Uthrive is a lightly sparkling natural hydration drink made with Lake Deborah salt from Western Australia, real fruit juice and no added sugar. Built by a firefighter.
FAQ
How much should I drink when training in the heat?
It depends on your size, the conditions and how hard you're working. Drink regularly, and use before and after weigh-ins to estimate your losses. The AIS suggests replacing about 1.2 to 1.5 times the fluid lost after the session.
Do I need electrolytes for hot training sessions?
For short, easy sessions, water is usually fine. For long, intense or very sweaty sessions in the heat, adding electrolytes helps replace the sodium you lose in sweat.
What are the signs I'm not coping with the heat?
Headaches, dizziness, nausea, cramps and unusual tiredness are common signs. Confusion is a red flag. Stop, cool down and seek medical help.
This article is general information, not medical advice. If you have a health condition, or feel unwell in the heat, talk to your doctor.