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Working out in the heat can help you get fitter

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Working out in the heat can help you get fitter

Hot, humid days are already uncomfortable—now imagine that discomfort multiplied as you go all-out during an evening pickleball game or lunchtime run. For some, that heat can be enough to make you not want to exercise outside at all. 

But, now is the time to use that workout inspiration we’re all getting from the summer Olympics—because, according to experts, working out in the heat can help us get fitter, if we do it correctly.

Why is exercising in the heat so hard?

Higher temperatures and stifling humidity make the body work harder. 

“I always think that exercise and heat is a big cardiovascular challenge,” says Chris Byrne, registered physiotherapist and senior lecturer at the University of Exeter.

That’s because our cardiovascular system has to juggle two substantial jobs: circulating blood, oxygen, and metabolic fuel to our muscles, and cooling our bodies down.

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“There’s competing demands. Some of…the cardiac output from the heart needs to be channeled into losing heat,” Byrne says. “That can start causing problems.”

That’s when what Byrne calls “heart rate drift” can happen.  In cooler conditions, your heart rate will remain steady while maintaining the same effort during exercise. In the heat, despite running at the same speed, for example, heart rate starts to drift up. “And that is a sign of the cardiovascular system putting more focus on heat loss,” Byrne says.

What is heat adaptation?

“Our physical fitness in the hot environment can certainly be improved through things like heat training,” says Chris J. Tyler, who researches the impact of environmental extremes on the human body at the University of Roehampton in Britain. 

With properly paced and progressive training, our bodies can not only adjust to heat, but we’ll also be able to work out harder at hotter temperatures, Tyler says.

That’s where three vital physical adaptations come in: 

  1. lower core body temperature
  2. higher blood volume, which leads to higher stroke volume—the amount of blood ejected by heart beats
  3. lower resting heart rate. 

Those adaptations interact to make your cardiovascular system function more efficiently, with a higher volume of blood leaving the heart per minute, Byrne explains.

Heat adaptation leads to a lower resting core body temperature in order to improve our ability to lose heat, Byrne says. Our body temperature can lower from the standard 98.6 F to as low as 97.7 F—giving us a lower starting temperature as we begin exercising, meaning we’ll start sweating earlier, cooling down earlier, and we won’t get as hot as quickly. 

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Byrne says we also start to sweat earlier at our newly lowered body temperature. That means our bodies have adapted to trigger heat loss mechanisms more quickly, which helps us cool down.

With these adaptations, you can reach much higher cardiac outputs—or much harder efforts—during exercise, Byrne says. 

“These adaptations allow the heart to function more efficiently to meet those dual tasks of supplying fuel to working muscles and losing heat from working muscles,” Byrne says.

Here’s how safely heat train

Heat adaptations can occur quite quickly, says Tyler, if you do it right.

“The adaptation isn’t getting hot—it’s getting hot and staying hot,” Tyler says. “It’s not how long you exercise for, it’s how long you’re hot.”

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Byrne advises to work out for at least 30 minutes every day, or 60 minutes every other day, if you’re running or cycling—at whatexperts would call “submaximal effort.” 

Even if your heart is pounding in the heat, your core temperature may not be high enough to reap heat adaptation benefits. It’s most ideal to get that core temperature high and keep it high for at least 30 minutes, Byrne says, since it takes a longer time for body temperature to rise and fall than it does heart rate. 

You can start to see those benefits as soon as five to seven days into daily training, Tyler says. If you’re exercising more like every other day, then he says you can expect to see those adaptations in about two weeks, maybe sooner.

When it comes to other types of exercise—like pickleball, tennis, or football—which include high intensity intervals, Byrne says heat adaptation is possible, even with brief rest periods between sets or games, since body temperature takes a while to fall.

“With something like tennis, you’ll probably see a rise in body temp, and if there’s a break in between sets you’ll probably see a subtle fall, but quickly it’ll be back up again,” Byrne says.

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Even with adaptations, training in hot conditions is hard, especially when you first start out. Tyler says the key is to start slow, gradually increasing the difficulty.

“Just like you wouldn’t go to the gym and instantly try and lift 400 pounds, you might start light and get heavier as you progress,” Tyler says. If you go too quickly, he warns, you could get injured or suffer from heat-related illnesses. On the other hand, if you don’t increase the difficulty at all, you likely won’t see your fitness progress much.

Starting slowly can look like going for a 30-minute jog with walk breaks, Byrne says, and then building up gradually from there.

The average athlete should pay attention to heart rate and rate of perceived effort, or RPE, Tyler says. Once you see your heart rate lower during the same workouts and feel that they become easier than when you first started heat training, that’s when you feel those adaptations happening in real time.

How to stay safe in the heat

Safety should be your number one priority. Heat illnesses are real—and can be deadly in the most extreme cases. 

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Byrne advises to only exercise in what you can handle—if you feel you’re overheating, slow down or stop immediately and cool down. Humidity can be a dangerous factor as well, he says, as the moisture in the air prevents you from sweating—one of the most vital things our body does to cool down.

Here’s advice from experts and the CDC on how to stay safe while going after summer goals:

  • Stay hydrated. Byrne advises to keep fluids and electrolytes on hand, especially for if you’re working out longer than 60 minutes.
  • Don’t over hydrate: drinking too much plain water can be dangerous.
  • Take it slow. Byrne advises beginners to start with something like a 30-minute jog with one-minute walking intervals dispersed throughout.
  • Take some time off if you’re sick or have been sick recently.
  • Slow down or stop if you feel overheated.
  • Drink more water than usual, and don’t wait until you’re thirsty to drink more. 
  • Wear loose, lightweight, light-colored clothing.
  • Look for signs of heat illnesses. Seek shade and hydrate immediately if you feel symptoms like dizziness, delirium, nauseousness, headaches, or muscle cramps.
  • People over 65—who aren’t marathon runners or highly trained—and children should avoid strenuous outdoor activity in the summer heat.

More on working out:

Fitness

Jogging 101: Benefits for Your Body and Mind

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Jogging 101: Benefits for Your Body and Mind

Walking and running share a number of benefits — but what about that sweet middle ground between the two?

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“Jogging is about creating a steady pace,” says sports and exercise medicine specialist Leonardo Oliveira, MD. “Instead of focusing on speed, you’re focused more on endurance with good, quality steps.”

Before your next jaunt, Dr. Oliveira shares the many benefits of jogging and how it can help improve your overall health and wellness.

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9 benefits of jogging

Unlike running, where you’re focused on targeting different heart rate zones, jogging involves keeping a more stable and persistent pace. If you’re jogging at a moderate intensity, for example, your target heart rate will usually fall into zone 2, at 60% to 70% of your max heart rate.

“When you’re jogging, you should be able to carry on a conversation as you breathe through your nose,” says Dr. Oliveira. “If you’re doing just 15 minutes of jogging three times a week, you’re already going to notice the benefits.”

Here’s how you can benefit from jogging.

1. Reduces stress

Jogging, like other exercises, can help decrease your stress levels. As an aerobic exercise, it helps release endorphins, which can boost your mood and create feelings of euphoria or satisfaction. Not only does it provide an outlet for pent-up energy, but jogging outside also allows you to spend more time in nature, which provides even more mental health benefits.

“Research shows exercise can be as effective as medication when treating depression because of its wide-ranging benefits,” says Dr. Oliveira.

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2. Burns calories

Jogging is a full-body exercise that offers a higher calorie burn than some other aerobic exercises. According to the widely used Compendium of Physical Activities, jogging burns about 7.5 calories per kilogram of body weight each hour. That means you can burn about:

  • 8 times as many calories as sitting quietly
  • 4 times as many calories as walking
  • 2.6 times as many calories as stationary cycling

“Jogging will burn more calories in a shorter period of time than cycling, especially if you’re not used to exercising,” reports Dr. Oliveira.

3. Improves insulin resistance and boosts metabolism

Insulin resistance is one of the biggest barriers to having a healthy metabolism. Insulin helps your body break down glucose for energy. But if your body can’t do that, your metabolism slows down, leading to:

  • Lower energy levels
  • Weight gain
  • An inability to burn fat

“Exercising at higher intensities helps increase metabolism and insulin resistance,” says Dr. Oliveira. “But researchers have also found that even lower-intensity exercises, like jogging, for longer periods of time can have the same effect.”

4. Strengthens your heart

Jogging also has positive impacts on your heart and its ability to pump blood to the rest of your body. That’s because it contributes to hypertrophy, or the strengthening of your heart’s muscle tissues.

“As you develop endurance, the amount of blood in one pump increases,” explains Dr. Oliveira. “When your heart gets stronger, it contracts more efficiently, which decreases your resting heart rate.”

5. Improves lung expansion and gas exchange

The more you work on building endurance and stamina, the more likely it is that you’ll improve your overall ability to breathe — both at rest and while jogging.

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“Consistent aerobic exercise helps your lungs get stronger and more efficient,” says Dr. Oliveira. “Over time, you won’t need to breathe as often because each breath brings in more oxygen than before.”

6. Activates muscles

Jogging activates major muscle groups, including your:

  • Quads
  • Hamstrings
  • Glutes
  • Core
  • Back

“Strength training is a good complement to jogging because it can help strengthen all the areas of your body,” says Dr. Oliveira. “This can help you handle longer distances.”

7. Reduces stiffness

“Jogging is one of those activities where once you get going, you start to feel better,” notes Dr. Oliveira. “It’s an exercise that helps warm up your muscles and lubricate your joints, which can help with the overall sense of stiffness that comes with age.”

That said, jogging is still a high-impact exercise because it forces you to bear down weight as your feet hit the pavement. Consider working with a physical therapist or athletic trainer to reduce the risk of further injury if you:

  • Have arthritis
  • Have an active injury
  • Had previous sprains or fractures in your lower body

8. Improves endurance

“The more you jog, the more you’ll increase your functional aerobic capacity,” says Dr. Oliveira. “Someone who jogs regularly will have better physical fitness that will help them last longer on a bike or a walk than someone who’s just getting started.”

Your ability to breathe and move also extends to other daily activities that demand cardiovascular strength and endurance, like climbing stairs.

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9. Provides better quality of life and other mental health benefits

Research shows that any amount of jogging — even just once a week — can improve your quality of life and lower your risk of dying from cancer and cardiovascular-related issues.

“Jogging is a great form of exercise, but it’s not the only one,” notes Dr. Oliveira. “The most important thing is to work on being healthy and strong. And for a lot of people, if you’re looking to advance your physical fitness, jogging is a good place to start.”

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Michelle Yeoh, 63, uses ‘exercise snacking’ to stay fit – here’s why mini workouts have big benefits

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Michelle Yeoh, 63, uses ‘exercise snacking’ to stay fit – here’s why mini workouts have big benefits

As an increasing number of scientific studies are published citing the benefits of ‘exercise snacking’ – short bouts of physical activity sprinkled throughout the day – one celeb has sworn by the practise for several years already. The woman in question? Acting great Michelle Yeoh. Below, we look at the power of mini workouts and why the Oscar-winner’s go-to move is so effective.

Stretching

Michelle revealed to Vogue that she incorporates fitness into her morning routine in a way that’s incredibly time-efficient. ‘Remember, you can do your kicks, you can do your stretches, while you are also waking up,’ she said. Indeed, research has shown that regular stretching can improve flexibility, reduce muscle stiffness and improve blood circulation – all crucial elements of healthy ageing.

And you don’t have to stretch for very long, either. One study found that while static stretching improves flexibility in adults, there was no additional benefit observed beyond four minutes per session or 10 minutes per week. So, it seems that a short stretching sesh (you don’t even have to get out of bed to do it) like Michelle’s is a very worthwhile habit to adopt.

Squats

In her Vogue interview, Michelle also shared that she performs squats most days while doing her skincare routine. Virtually every expert and trainer we speak to here at Women’s Health lists squats as one of the most important moves for women to do as they age. A compound exercise (when multiple muscle groups are used), squats also mirror the vital movement pattern of sitting down and getting back up again.

Numerous studies have highlighted the benefits of this simple exercise for posture, strength and power, and one paper even found that intermittent squat exercises performed during prolonged periods of sitting may boost brain power. Whether you’re squatting mid-moisturise like Michelle or while you’re waiting for the kettle to boil, the science suggests sprinkling squats into your day can be really quite powerful.

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The power of habit stacking

As Michelle’s routine shows, adopting a sustainable exercise routine often relies on habit stacking – adding a movement to something you already do every day, like doing your skincare or brushing your teeth.

BRB, we’re just off to do our daily squats.


After years living with endometriosis and undergoing seven rounds of IVF, Radio 4 presenter Emma Barnett turned to training with PT Frankie Holah to rebuild strength and a more positive relationship with her body. Download the Women’s Health UK app to access Frankie’s full training plan.

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Hannah Bradfield is a Senior Health and Fitness Writer for Women’s Health UK. An NCTJ-accredited journalist, Hannah graduated from Loughborough University with a BA in English and Sport Science and an MA in Media and Cultural Analysis.  She has been covering sports, health and fitness for the last five years and has created content for outlets including BBC Sport, BBC Sounds, Runner’s World and Stylist. She especially enjoys interviewing those working within the community to improve access to sport, exercise and wellness. Hannah is a 2024 John Schofield Trust Fellow and was also named a 2022 Rising Star in Journalism by The Printing Charity.  A keen runner, Hannah was firmly a sprinter growing up (also dabbling in long jump) but has since transitioned to longer-distance running. While 10K is her favoured race distance, she loves running or volunteering at parkrun every Saturday, followed, of course, by pastries. She’s always looking for fun new runs and races to do and brunch spots to try.

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I Have a Master’s in Exercise Science. These Are the Only 6 Strength Moves You Need To Build Muscle

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I Have a Master’s in Exercise Science. These Are the Only 6 Strength Moves You Need To Build Muscle

Strength training doesn’t have to be complicated. Fitness content on social media may leave you thinking that you should only work out at specific times, use certain weights and incorporate an ever-rotating assortment of moves — but to reap the full benefits of building muscle, you can actually keep things surprisingly simple.

The Physical Activity Guidelines for Americans recommends at least two days of resistance training, aka strength training, for adults each week as part of their workout routines. And those two days need only include six moves, Adrian Chavez, Ph.D., nutrition and health coach, tells TODAY.com.

It’s often the most advanced fitness routines that generate the most buzz online. And while having lots of different strength moves in your arsenal can stave off boredom at the gym, it’s not usually necessary, Chavez explains. Sticking to the basics and staying consistent will give you the most bang for your buck, he adds.

The Most Efficient Strength-Training Moves

The six moves Chavez says are most efficient for improving health and body composition are:

“Those movements cover all of the (major) muscle groups of the body,” Chavez says. “I wouldn’t necessarily say these are the only six movements that you need, but those are the ones that are going to work the largest amount of muscle in each movement.”

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Building muscle through strength training can boost longevity, a mood, bone density and more.

It’s also a key factor to improving metabolic health, Chavez points out. Muscle burns calories, even while you’re at rest. So, the more muscle you have, the more calories you’ll burn.

If you’re after efficient results, focusing on these six movements that target the body’s largest muscle groups will get you there since these muscles require the most energy to function.

Which Muscles Does Each Move Target?

The overhead press primarily targets the shoulders, says Chavez. It also works the triceps, the trapezius muscles in your upper back and the core.

Perform a chest press when you’re looking to strengthen your pectoralis muscles, the two largest in the chest. These muscles are responsible for lifting, rotating and pushing.

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By including a back row in your strength training routine, you’ll be working your upper back and biceps, says Chavez.

The overhead pull-down or pull-up will strengthen your latissimus dorsi muscles (lats), which extend from the lower back to the armpit. Chavez says you’ll be engaging your biceps, too.

Squats work the quadricep muscles (quads) in the thighs, hamstrings and glutes, says Chavez. They’ll also engage your core, since squats require stability.

Include deadlifts in your routine to challenge your quad muscles in the thigh, hamstrings, glutes and lower back, says Chavez. You can choose between the regular deadlift and the Romanian deadlift, or incorporate both into your workout.

Benefits of a Consistent Strength Training Routine

Studies show that consistency when strength training, rather than the complexity of your workout plan, is what makes the biggest difference for health. Any kind of resistance training compared to none at all improve sstrength, muscle function and endurance regardless of intensity, equipment type and variation, research shows.

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These six moves are not the only effective workouts for improving strength and altering body composition, but if you were to stick only to these six, you’d be in great shape, he explains.

Regular strength training will not only improve your physique but also your quality of life. “When you do a deadlift, that’s like picking up your kid,” Chavez says, comparing pull-ups to playing with them on the monkey bars.

“Carrying groceries, moving furniture, all of those things become a lot easier when you build some strength. And … these six movements cover all of the major muscle groups, so that will translate into really changing the way that you experience life,” he adds.

How to Add Variation

Once you’ve committed to a training plan you’ll use again and again, you may also want to mix things up, Chavez says.

To avoid boredom or to add an additional challenge, most of the six moves have variations.

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For example, narrow-stance squats isolate the quads. Or you can change the grip during bicep curls to also target the forearms. “Learning slight variations to these primary movements is how you really build out a good routine,” he says.

An ideal workout program includes strength training at least two times a week and additional sessions with a type of cardio you enjoy. Chavez plays basketball, runs and rides his bike in between strength training sessions. He also suggests walking, swimming or rowing.

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