Beat the Heat: How to Train Safely and Keep Making Progress During a Heatwave

When the temperature spikes, even a routine workout can feel gruelling and punishing. While it’s tempting to completely press pause on your routine during a heatwave, you don’t have to sacrifice your goals.

Training in severe heat puts extra stress on your cardiovascular system and speeds up dehydration, but with a few strategic adjustments, you can stay active throughout.

1. Shift Your Training Clock

Sunshine and ambient humidity peak between 11:00 AM and 4:00 PM, making midday workouts a fast track to heat exhaustion. If you typically train during the day, you should try shift earlier before the sun has time to heat everything up to a boil, or later in the evening when everything has had the chance to cool down.

• Early Morning: Aim to work out before 8:00 AM. Humidity might be higher, but ambient temperatures and solar radiation are at their lowest.
• Late Evening: If mornings aren’t your thing, wait until well after 7:00 PM when the sun’s intensity drops.
• Go Find A Miracle: If you are lucky enough to have an adequately air-conditioned gym floor or health centre, then you’ll be just fine (lucky you).

2. Upgrade Your Hydration (Water Isn’t Enough)

Sweating heavily depletes both fluid and vital electrolytes -specifically sodium, potassium, and magnesium. No matter how it feels or how fit you are, you will always sweat more, and more than you’d think too. Drinking litres of plain water without replacing sodium can lead to hyponatremia (low blood sodium levels), causing cramping, dizziness, and nausea.

If you don’t have enough electrolytes specifically sodium, the water you drink struggles to get absorbed, so make sure if you are active that you are replenishing your electrolytes daily!

How to Hydrate in The Heat:

• 30 Minutes Hour Before Exercise: Drink 500ml of water.
• During Exercise: Sip at 500ml with either an electrolyte mix (this is the one I use) or a pinch of salt added to your water at the least.
• The Rest Of The Day: Keep sipping! Don’t down a bottle of water because you feel thirsty, the key is little and often!

3. Drop the Intensity, Not the Routine

High heat automatically raises your resting heart rate because your body works overtime pumping blood to the skin to cool off. This means your usual easy cardio pace or workout intensity might feel like your pushing for a PB.

• Lower the Load: Reduce lifting weights, set volume or your movement pace slightly.
• Pace Yourself: Extend rest intervals between sets, or splits if you are running, to allow your heart rate to recover.

4. Master the Post-Workout Cooldown

How you recover after training in high heat dictates how well you’ll feel for the rest of the day.

1. Lower Core Temp First: Don’t jump straight into a ice-cold shower right away (which can cause blood vessels to constrict rapidly). Instead, use lukewarm or tepid water, or place a cool towel on your neck, wrists, and groin.
2. Fuel with Water-Dense Foods: Reach for snacks with high water content like watermelon, cucumbers, oranges, or Greek yogurt mixed with berries to keep you hydrated and full.

5. Know The Warning Signs & When to Stop: Heat Exhaustion vs. Heat Stroke

Pushing through the pain can be a fatal mistake in extreme weather. Learn to differentiate between discomfort and dangerous heat illness:

Indicator / Symptom	Heat Exhaustion (Act Immediately)	Heat Stroke (Emergency!)
Body Temp	Normal or slightly elevated	Dangerously high (over 39.4°C / 103°F)
Skin State	Heavy sweating, cool & clammy	Hot, red, dry (or heavily sweating)
Pulse & Breathing	Fast, weak pulse	Fast, strong pulse
Mental Clarity	Dizzy, tired, mild headache	Confused, slurred speech, fainting
Action Required	Move to a cool area, sip fluids, apply cool towels	Call An Ambulance; cool body rapidly

Bottom Line

Listen to your body. A heatwave is a time to maintain consistency, stay hydrated, and focus on longevity, not for setting personal records under the blazing sun. Adjust to your environment, dial in your electrolyte balance, and protect your health.