10 Mistakes People Make When Working Out During a Heatwave
Is it safe to exercise during a heatwave? Learn the 10 biggest workout mistakes people make in hot weather and how to train smarter this summer.
By
July 21, 2026
When it's 40+°C outside, your workout doesn't have to stop—but it probably shouldn't look the same as it did a month ago.
The heat puts extra stress on your body, making even familiar workouts feel much harder. The good news? A few simple adjustments can help you stay safe, perform better, and recover faster.
Here are 10 mistakes to avoid.
By the time you feel thirsty, you've already started to become dehydrated. Instead:
Sweating is your body's cooling system—not a measure of calorie burn. Losing 2 kg during a workout usually means you've lost water, not body fat.
Don't be surprised if your pace is slower or the weights feel heavier. Your body is working overtime just to keep you cool.
After a long or sweaty session, replacing water alone might not be enough. Your body also loses important minerals like sodium through sweat.
Heavy cotton and dark colours trap heat. Light, breathable clothing helps your body cool itself more efficiently.
Feeling dizzy, nauseous, unusually weak, or confused? Stop, cool down, and hydrate. Pushing through isn't a badge of honour.
Large meals and hot weather aren't the best combination. A lighter meal 2–3 hours before is usually easier to digest.
Your body needs longer to adjust in the heat. Spend extra time warming up gradually before increasing intensity.
Rehydrate, eat a balanced meal, and get enough sleep. Recovery becomes even more important when temperatures rise.
Sometimes the smartest athlete is the one who adapts.
Reducing intensity by 5–10% on extremely hot days can help you train consistently without increasing unnecessary risk. Consistency beats one heroic workout.
A heatwave doesn't mean you have to stop exercising. It just means you need to be a little smarter about how you do it.
At CrossFit Martell, every workout can be adjusted to the conditions and to your fitness level. Because staying consistent will always beat pushing too hard on one scorching day.
