Running in hot weather

In summer, heat makes every run harder: your heart rate climbs, your pace drops, fatigue sets in faster. It's normal — and it can be managed.

Why it's harder in the heat

Your body has to both fuel your muscles AND cool itself down: some of your blood is diverted to your skin to release heat. As a result, at the same effort level, your heart rate rises and the pace feels more difficult. This isn't a loss of fitness.

Adjust your pace, not your ego

In high heat, think in terms of effort (heart rate, how you feel) rather than pace: accept going slower. Your HR zones remain a good reference. Save your tough workout sessions for cooler days or times.

Choose the right time

Run early in the morning or in the evening, avoid the peak hours of 12 p.m.-4 p.m. Look for shade, routes near water, or switch to indoor cycling trainer / treadmill on very hot days.

Hydration

Drink before, during (on runs > 45-60 min) and after. In high heat and heavy sweating, also think about electrolytes (sodium), not just water. Light-colored, breathable clothing, a cap and sunscreen help.

Acclimatization

Good news: within 1 to 2 weeks of gradual exposure, your body adapts (you sweat earlier and better). Increase your heat exposure gradually, without pushing hard in the first few days.

Warning signs (not to ignore)

Stop immediately if you experience dizziness, nausea, chills, headache, lack of sweating or confusion: these are signs of heat stroke, an emergency. Get to shade, cool down, hydrate, and seek help if needed.

A plan that adapts to the weather and your fitness

Sports Coach AI takes your workload and recovery into account to adjust intensity — useful when heat is already putting stress on your body.