Heatwaves
Training During the UK Heatwave: How to Stay Safe and Keep Making Progress
The UK doesn't get many heatwaves, but when they arrive, they can make training feel much harder than usual.
Whether you're trying to lose body fat, build muscle, get stronger or simply stay active, the hot weather doesn't mean you need to stop training altogether. It does mean you need to be a little smarter with how you approach it.
Why Training Feels Harder in the Heat
When temperatures rise, your body has to work harder to keep itself cool.
Your heart rate increases, you sweat more, and your body diverts blood towards the skin to help regulate temperature. This means less energy is available for performance and recovery.
The result?
Workouts feel harder than normal
You fatigue quicker
You may struggle to hit your usual weights or times
Recovery can take longer
You can become dehydrated much faster
If your session feels tougher than usual, it doesn't automatically mean you've lost fitness. It might simply be the weather.
Hydration Is King
Most people underestimate how much fluid they lose through sweating.
Even mild dehydration can negatively impact:
Strength
Endurance
Concentration
Recovery
Energy levels
A good starting point is to drink regularly throughout the day rather than trying to catch up once you're thirsty.
If you're unsure how much water you should be drinking, check out our hydration guide:
👉 How Much Water Should You Be Drinking?
https://www.one-fitness.co.uk/blog/hydration
If you're training hard and sweating heavily, don't just replace water. You also lose electrolytes such as sodium, which play a huge role in muscle function and hydration.
Adding electrolytes to your water or slightly increasing your salt intake can be beneficial during hotter periods.
Adjust Your Expectations
This is not the time to chase personal bests every session.
Many professional athletes and sports teams adjust training loads during periods of extreme heat.
If your normal squat feels heavier than expected or your conditioning session feels tougher, that's completely normal.
Focus on:
Maintaining consistency
Training with good technique
Getting quality work done
Listening to your body
Taking longer rest periods when needed
One of the easiest ways to manage training during a heatwave is to increase your rest periods. Your heart rate will often stay elevated for longer in hot conditions, meaning you may need an extra 30-60 seconds between sets to recover properly.
This doesn't mean you're getting less fit or working less hard. Allowing yourself to recover sufficiently can help you maintain better performance, lift with better technique and complete more quality work throughout the session.
Remember, fitness is built over months and years, not a single workout.
Choose the Right Time to Train
If possible, train during the cooler parts of the day.
Early morning or later evening sessions will generally feel far more comfortable than training in the peak afternoon heat.
At One Fitness, one advantage of our early morning and evening sessions is that members can continue progressing without battling the hottest temperatures of the day.
Don't Ignore Warning Signs
Training should feel challenging.
Heat illness is different.
Stop exercising and seek medical attention if you experience:
Dizziness
Confusion
Severe headache
Nausea or vomiting
Excessive weakness
Loss of coordination
No workout is worth risking your health.
Focus on Recovery
Recovery becomes even more important during a heatwave.
Make sure you're:
Drinking enough fluids
Eating enough protein
Getting quality sleep
Managing stress
Taking rest days when needed
Poor recovery combined with hot weather can quickly lead to feeling run down.
The Bottom Line
The heatwave doesn't mean you need to stop training.
It means you need to train intelligently.
Stay hydrated, manage your expectations, take longer rest periods when needed, listen to your body and focus on consistency over perfection.
The people who make the best progress aren't the ones who have perfect conditions all year round.
They're the ones who adapt, stay consistent and keep showing up.
So if your workout feels a little tougher this week, don't worry.
Keep turning up, keep doing the basics well, and you'll be glad you did when the temperatures return to normal.
If you'd like help training safely and effectively this summer, get in touch with the team at One Fitness. Whether your goal is fat loss, strength, muscle gain or simply feeling fitter and healthier, we're here to help you stay on track whatever the weather.
