By Coach Adolfo Salgueiro
For anyone living in the Northern Hemisphere, the summer has been brutal. It gets sultrier year after year. In some areas, it’s the heat; in others, it is humidity; and in some, it is both. Conditions can get inhospitable and dangerous very quickly.
Last week I drove to my Thursday afternoon group run. As soon as I turned off the car’s air conditioning and set foot out in the open, I realized this was not happening. I decided to walk. I did so with one of my athletes and discussed her upcoming racing schedule. We walked for about an hour, got back drenched, and I was at peace with my decision. As I checked the temperature and humidity afterward, I learned the heat index was 98º (36.7ºC). Inhuman conditions.
I’ve already written about training in the heat this year (click here to read). Still, this experience got me thinking, yet once again, about accepting that I’ll survive the season rather than focusing on the metrics as a measure of success as if the temperature were 30 degrees lower (17ºC).
Alex Beach, a 2:24 marathoner based in South Florida, recently posted the following thought on Instagram: “I’m training year-round in a hot environment (Miami). Understanding the aerobic work you’re getting and not putting too much stress on hitting specific paces every workout in the heat allows you to avoid issues with overtraining.”
Running in the summer requires heavy adjustments. The weather is not just the temperature. It includes atmospheric pressure, visibility, pollen count, and more. When it comes to running, we must expand our perspective beyond temperature and, at the bare minimum, include wind and humidity in the equation.
What Happens to Your Body in the Heat?
As a runner, you must understand the physiology of training in severe heat. When you run in hot weather, your body works harder to keep itself cool. As your core temperature rises, your muscles become less efficient, you fatigue sooner, and your overall performance inevitably declines. Accept it.
To prevent overheating, your body redirects blood to your skin, blood that would normally supply oxygen to your working muscles. From the skin, the heat is released. In dry conditions, sweat evaporates, and you cool down. In humid weather, that sweat doesn’t evaporate as easily, making it much harder for your body to regulate its temperature. That’s why running in heat and humidity feels significantly tougher than running in dry heat, even at the same pace.
So, account for that reality and focus on effort rather than metrics. The people you’re trying to impress on Instagram don’t know you, won’t visit you in the hospital if you suffer heat stroke. They certainly won’t help pay your medical bills.
What to do when it is too hot to run outside?
One of the best pieces of advice I’ve heard on summer training comes from Steve Magness, a renowned running coach, author, and performance expert who has guided athletes from high school to the Olympic level. His recommendation is simple: always give yourself a way out.
He explains how in extreme heat and humidity, it’s much easier to dig yourself into a hole that can take days, or even weeks, to recover from. Instead of stubbornly forcing yourself to complete every mile exactly as planned, build flexibility into your workouts. Rather than committing to a continuous hard workout, consider breaking it into shorter intervals with brief recovery periods. If your body is sending warning signs, don’t be afraid to stop early. Adjusting a workout isn’t a sign of weakness. It’s a smart decision that allows you to recover, stay consistent, and be ready for your next quality session. Summer training rewards athletes who know when to push and, just as importantly, when to back off.
In conclusion: Don’t try to be a hero. No PR is worth a heat injury. No social media post is worth a health breakdown. No Strava kudos are worth an ambulance ride. Be smart, play it safe, and always live to run another day.
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