Training in the Heat: Your Safety and Performance Guide

Exercising in high temperatures demands careful planning and awareness. While there’s no universal “danger zone” temperature—a heatwave is 32°C in the UK but 40°C in Spain—the risks are real. Here’s how to train smart and stay safe when the mercury rises.

Older adults, children, and those with cardiovascular or blood pressure conditions are at higher risk. If you feel dizzy, weak, or nauseous, stop immediately and seek shade.

Drink ~500ml of water one hour before exercise.

Sip 150–200ml every 15 minutes during activity.

For sessions exceeding one hour, use electrolyte drinks to prevent hyponatremia.

Avoid sugary or caffeinated drinks—they can increase dehydration.

Allow 7 days for your body to adapt. Reduce intensity and duration by ~30% in the first week.

Train during cooler hours: early morning or late evening.

Wear light-colored, breathable, and loose-fitting clothing.

When temperatures exceed 38°C, consider moving indoors or shortening outdoor sessions to under 30 minutes.

Listen to your body: muscle cramps, headache, or nausea are signs to stop.

Yes—with caution, if you’re healthy, heat-acclimatized, and hydrate rigorously (500–1000ml of electrolyte fluid per hour).

Train Smart, Not Hard

Heat doesn’t have to stop you—but it should make you smarter. Prioritize safety over intensity, know your limits, and when in doubt, take it indoors.