Tips for Working Out in the Heat Safely (Plus Its Benefits)

When nicer weather returns, it’s exciting to move your workouts outdoors, adding plenty of fresh air and scenic sights to the experience. However, working out in the heat can cause dehydration and overheating when it’s not done with caution.

There are ways you can work out in the heat safely, stay cool and maintain healthy hydration levels. With these simple tips, you can continue to enjoy the outdoors while getting in your daily physical activity.

Is it safe to work out in the heat?

Working out in the heat can be safe for many healthy adults when the workout is planned carefully, the intensity is adjusted and hydration is prioritized. The biggest risks are dehydration, heat cramps, heat exhaustion and heat stroke, especially when temperatures are high, humidity is elevated or you exercise in direct sun.

A safer approach is to exercise early in the morning or later in the evening; choose shaded routes when possible; shorten or lower the intensity of your workout; drink fluids before, during and after exercise; and stop immediately if you feel faint, weak, dizzy, nauseated, confused or unusually fatigued. If conditions feel extreme, move the workout indoors.

The Centers for Disease Control and Prevention specifically warns that people exercising on hot days are more likely to become dehydrated and develop heat-related illness, and experts say to stop activity and move to a cool place if you feel faint or weak.

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Tips for working out in the heat

1. Hydrate and rehydrate

This seems pretty obvious, but staying hydrated is critical when working out in the heat. You will sweat out the water you drink, so it’s even easier to become dehydrated.

Research has shown that going into a workout hydrated is very important. Not only should you drink plenty of water before, during and after your workout, but eating foods that help restore electrolyte balance is also helpful.

Before and after exercise in the heat, eat or drink naturally hydrating foods that provide electrolytes, such as coconut water, watermelon, cucumber, celery, citrus fruits and carrots.

After workouts, be sure to replace water and sodium loss by drinking two to three extra cups of water and eating sodium foods, such as pickles and  sauerkraut, and adding a pinch of sea salt to meals.

A helpful way to monitor hydration is to pay attention to thirst, urine color, sweat rate and how you feel during the workout. Very dark urine, dizziness, headache, rapid fatigue or a drop in performance can be signs that you need more fluids and a break from the heat.

For longer workouts, very sweaty workouts or sessions lasting more than about an hour, electrolytes may be helpful because sweat contains sodium and other minerals. Avoid overdrinking plain water without replacing electrolytes during prolonged heat exercise, since that can contribute to low sodium levels in some cases.

2. Plan wisely

If you plan to exercise outdoors, choose a cooler time of day when the sun isn’t shining on you at its hottest. Mornings and late afternoon/early evening are great times to work out, but minimize your exposure to direct sunlight.

Before heading outside, check more than the temperature. The heat index tells you how hot it feels when humidity is factored in, while wet bulb globe temperature, or WBGT, gives a more complete picture for outdoor activity because it accounts for temperature, humidity, wind speed, sun angle and cloud cover.

As a general rule, be more cautious when the heat index climbs, when humidity is high or when you will be exercising in direct sunlight. If the “feels like” temperature is high, choose a shorter, easier workout, take more breaks or move your session indoors.

3. Consider a pre-workout shower

Research has suggested that manipulation of pre-exercise body temperature can influence your workout performance and may be an effective strategy for athletes competing in stressful environments. Taking a cool shower or a quick swim before exercising in the heat is a good way to reduce body temperature.

4. Wear light-weight clothing

Avoid wearing dark-colored clothing when exercising in the heat. Go for whites or even bright clothes that reflect the sun.

You’ll also stay cooler with light-weight clothing and moisture-wicking garments that bring sweat to the outer surface and help keep you dry. You may find that loose-fitting shirts help keep you cool as well.

5. Bring an ice pack

If you become overheated, placing an ice pack on the back of your neck can help cool you down. You can also use a cold wash cloth to relieve the heat.

6. Listen to your body

It’s important to know your limits when exercising in the heat. If you begin to feel light-headed, dizzy or nauseous, it’s time to rest and drink water.

Excessive sweating can lead to heat exhaustion and have dangerous consequences, so monitor your water intake and energy levels as you go through your exercise routine.

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7. Keep it short

If you’re not used to extended workouts in the heat, keep your routine short, starting at about 20-30 minutes. Let your body get used to physical activity in the heat, whether it’s outdoors or during a heated class like hot yoga.

8. Allow your body to acclimate

If you’re not used to exercising in the heat, give your body time to adjust. Gradually increase your exposure over seven to 14 days by starting with shorter, less intense workouts during the cooler parts of the day.

This process helps your body adapt by improving its ability to regulate temperature, increasing sweat efficiency and enhancing cardiovascular function. Skipping this acclimation period can raise your risk of heat-related illnesses.

9. Adjust your workout for the heat

Don’t push your body to the same intensity as you would in cooler weather. When working out in the heat, reduce the intensity, shorten the duration or increase your rest intervals.

Modify your training goals to maintain safety and performance without overexertion.

10. Use sun protection

Apply a broad-spectrum, sweat-resistant sunscreen with at least SPF 30 before heading outdoors. Wear light-colored, moisture-wicking clothing, a breathable hat and UV-blocking sunglasses to protect your skin and eyes from sun damage while exercising in the heat.

11. Understand your limits and take breaks when needed

Pay attention to your body’s cues. If you feel dizzy, weak, confused, nauseated or stop sweating, it’s time to stop immediately.

Rest in a shaded or air-conditioned area, and hydrate. Regular breaks, especially during high heat, can help prevent overheating and dehydration.

12. Consume cooling foods before and after your workout

Eating hydrating and cooling foods like watermelon, cucumber, oranges and coconut water can support thermoregulation. Before exercising in the heat, opt for light meals high in water content. Afterward, focus on replenishing fluids and electrolytes with nutrient-rich snacks or smoothies.

13. Be aware of humidity vs. dry heat

Humidity reduces your body’s ability to cool itself through sweat evaporation, making you feel hotter and more fatigued. Dry heat, while allowing for better evaporation, can cause you to underestimate how much fluid you’re losing.

Monitor both temperature and humidity before heading outside to ensure you’re prepared for the conditions.

14. Know the warning signs of heat exhaustion and heat stroke

Exercising in the heat increases the risk of heat-related illnesses. Signs of heat exhaustion include heavy sweating, cold or clammy skin, muscle cramps, fatigue, headache, and dizziness.

If not treated, it can progress to heat stroke, a life-threatening condition marked by confusion, rapid pulse, dry skin and body temperature above 103 degrees Fahrenheit. Call emergency services immediately if you suspect heat stroke.

15. Recognize when to move your workout indoors

Sometimes the safest heat workout is the one you modify. Move exercise indoors if there is an active heat alert, the heat index feels dangerous, humidity is high enough that sweat is not evaporating, air quality is poor, you are recovering from illness, or you notice early warning signs like dizziness, headache, nausea, muscle cramps, weakness or unusual fatigue.

Indoor options like walking on a treadmill, cycling, strength training, mobility work, swimming or a lower-intensity bodyweight circuit can help you stay consistent without forcing your body to handle extreme heat stress.

Benefits of exercising in the heat

1. Improves your endurance

Exercising in the heat helps you become more comfortable with an uncomfortable setting. It forces you to push through the discomfort, thereby improving your tolerance for tough workouts.

Research has indicated that people who are more acclimated to the heat and fully hydrated have less body heat storage and perform optimally during exercise-heat stress.

2. Prepares you for competitive events

Because working out in the heat helps build endurance and tolerance to stress on the body, it can be useful in training for competitive events. Your ability to do intense workouts for extended periods of time will be greater after training in the heat.

3. Increases sweat and blood circulation

Your body naturally responds to heat exposure by increasing sweat production and blood circulation. Learning how to adapt to these circumstances allows your body to become more able to work out in a range of temperatures.

Plus, working out in the heat safely can improve your heart and sweat rate, thereby boosting cardiovascular health.

4. Promotes detoxification

Research has revealed that individuals routinely have sweating rates of one liter per hour when working in hot environments. This sweat rate promotes detoxification and allows your body to expel toxins within the body.

Remember that you need to replenish these fluids by drinking plenty of water after an outdoor workout.

5. May burn more calories

Working out in the heat can temporarily increase calorie expenditure because your body works harder to regulate its core temperature. This thermogenic effect may boost fat oxidation and metabolic rate, especially during moderate-intensity workouts.

However, this should not replace long-term strategies like strength training and consistent aerobic activity for weight management.

6. Helps enhance cardiovascular health

Exercising in the heat places greater demand on your heart and circulatory system, improving your cardiovascular efficiency over time. With proper adaptation, it may increase plasma volume, enhance cardiac output and improve endurance, making your heart stronger even during workouts in cooler environments.

7. Exposes you to vitamin D

Outdoor workouts in the sun support natural vitamin D synthesis, which plays a key role in bone health, immune function and mood regulation. Just 10-30 minutes of midday sunlight on exposed skin a few times per week can help maintain healthy vitamin D levels.

Be sure to balance sun exposure with skin protection to avoid burns.

8. Boosts mental health

Being outside in nature, soaking up sunlight and completing a challenging workout can all enhance your mood and mental clarity. Studies have shown that exercising in the heat, when done safely, can improve resilience, reduce stress and foster a greater sense of accomplishment.

Risks and side effects

When exercising in the heat, you need to know your limits and the warning signs of heat exhaustion. Everyone handles exposure to heat and physical activity in high temperatures differently, so you need to be aware of your personal limitations.

If you experience any of the following symptoms, it’s important to stop your workout, hydrate and get your body back to a normal temperature:

• fatigue
• weakness
• muscle cramps
• nausea
• vomiting
• headache
• dizziness
• problems with vision
• excessive sweating
• confusion
• low blood pressure
• dehydration

Some people need to be especially cautious when working out in hot weather. This includes older adults, children and teens, pregnant women, people with heart disease or other chronic health conditions, people who are not acclimated to heat, and anyone exercising at high intensity or for long periods outdoors.

Certain medications can also make heat harder on the body by affecting sweating, thirst, fluid balance, blood pressure or sun sensitivity. These may include some diuretics, blood pressure medications, antihistamines, antidepressants, antipsychotics, stimulants, diabetes medications and other prescriptions.

Do not stop taking medication on your own, but talk to your healthcare provider about a hot-weather exercise plan if you take medication or have a medical condition.

There are phases of heat-related health issues, starting with feelings of weakness and dizziness, experiencing heat cramps, and progressing to heat exhaustion and then heat stroke, which is a medical emergency that can cause serious damage. It’s critical to avoid any of these symptoms when taking your workouts outdoors or into high temperatures.

In addition, working out in the heat can be more difficult, which could lead to decreased exercise performance. If you plan on trying to avoid working out in the heat during the hottest times of the day, it also leaves you fewer time frames to exercise during the day.

Frequently asked questions

Is working out in the heat good for you?

Working out in the heat may offer benefits, such as improved heat tolerance, sweating efficiency and cardiovascular adaptation, but only when it is done safely and gradually. It is not automatically better than exercising in cooler conditions, and the risks increase when humidity, direct sun, dehydration or high intensity are involved.

How hot is too hot to work out?

There is no single cutoff that applies to everyone, but it is time to be cautious when the heat index is high, humidity is elevated or you are exercising in direct sunlight. If the weather feels oppressive, you are not acclimated, or you cannot stay cool and hydrated, move the workout indoors, or choose a shorter, easier session.

What are the warning signs of overheating during exercise?

Warning signs include dizziness, weakness, headache, nausea, vomiting, muscle cramps, unusual fatigue, confusion, excessive sweating, stopping sweating, rapid heartbeat, low blood pressure or vision changes. Stop exercising right away, get to a cooler place, cool your body and hydrate.

Is it better to work out in the morning or evening during hot weather?

Morning and evening are usually better than midday because temperatures and direct sun exposure are often lower. Early morning may be especially helpful during heat waves because pavement, buildings and outdoor surfaces have not had as much time to absorb heat.

Should you drink electrolytes when working out in the heat?

Electrolytes may be useful for longer, hotter or sweatier workouts, especially if you are exercising for more than about an hour or notice salty sweat, heavy sweating, cramps or fatigue. Water is usually enough for shorter, easier sessions, but fluids and sodium become more important as sweat losses increase.

Conclusion

• Just like working out in the cold, working out in the heat can be challenging and invigorating all at once. It helps promote detoxification and build endurance, but it can also be dangerous if it’s not done correctly.
• To work out in the heat safely, it’s critical to stay hydrated (drink plenty of water before, during and after your workout), drink electrolyte drinks or eat electrolyte foods, keep your workout time short, avoid hours of direct sunlight, wear loose-fitting clothing, and use an ice pack to cool yourself off.
• Exercise in the heat can be useful for promoting blood circulation and sweating, building tolerance to stressful situations, and making you a more competitive athlete. However, if you notice any signs of heat exhaustion or heat stroke, stop your workout, reduce your body temperature and hydrate.