Fitness

Should you stretch before exercise? After? Never? Here’s what to know

Published

2 years ago

July 27, 2024

Should you stretch before exercise? After? Never? Here’s what to know

Panamanian gymnast Hillary Heron stretches as she trains for the Olympics at the No Limits Gymnastics Center in Panama City, Saturday, June 15, 2024, ahead of the Games in Paris. Stretching can help make you more flexible, improve range of motion in your joints — and feel good. Credit: AP Photo/Matias Delacroix, File

For many people of a certain age, high school gym class began with reaching for their toes. Then, over the years, we were told it was better to stretch after exercise.

It turns out, both those things can be true, but the differing advice has created some confusion.

Stretching can help make you more flexible, improve range of motion in your joints—and feel good. David Behm, who researches human kinetics at Memorial University of Newfoundland in St. John’s, Canada, offers this advice on when to stretch and how to do it safely:

Warm up first

It’s almost always good to stretch, but it’s better if you warm up first, said Behm, author of “The Science and Physiology of Flexibility and Stretching.” He recommends a light aerobic activity such as jogging, walking or cycling for five or 10 minutes.

Follow that with some static stretching, the traditional way of reaching and holding a position (think back to that gym class). You can then do activity-specific dynamic stretching, in which you warm up the muscles with repetitive movements like leg lifts.

Behm says one minute is “the magic number” for how long to do static stretching per muscle group without fatigue.

Expand your definition of ‘stretching’

Should you always stretch before exercising? If it’s traditional stretching, not necessarily.

The better question, Behm says, is, “Should people increase their range of motion? Should people have better flexibility? And that is yes, because it helps prevent injuries. It helps with health. But you don’t have to stretch to achieve that.”

Resistance training, for instance, can be an effective form of stretching, he said. Doing a chest press increases range of motion in your deltoids and pecs, whether with barbells, dumbbells or machines, so there is no need to stretch beforehand. Just make sure to start with a small amount of weight to warm up and then add more to train.

“You probably don’t have to do extra stretching unless you’re a gymnast, a figure skater, or even a golfer who needs a great range of motion through that swing,” Behm said.

Nor do you need to stretch first if you’re going for a leisurely run. Simply start with a slow jog to warm up and then increase the pace.

Don’t do it if it hurts

After exercise, “light stretching is OK, as long as you don’t reach a point where you’re feeling pain,” Behm said. Since your muscles will be warm by that point, overdoing it makes you more likely to injure yourself.

Foam rollers can help with muscle recovery and have been shown to increases range of motion as well as stretching.

Do some static stretching before sports

If you’re playing a sport, Behm said, static stretching beforehand helps reduce muscle and tendon injury.

“If you’re going to do an explosive movement, change of direction, agility, sprint, any of these explosive activities that involve your muscles and tendons,” he said, “you’re going to be stronger if you do static stretching.”

People can especially get in trouble when they go back to a sport they used to play, whether it’s tennis, surfing or any sort of team activity.

Also, stretch both sides equally. Lacking flexibility on one side also can lead to injury.

Sounds simple. Why all the confusion?

Different studies over the years have either encouraged or discouraged stretching before exercise. Behm says that partly because some studies didn’t reflect real-life conditions, or were designed with elite athletes in mind, not regular people.

“If you’re Usain Bolt, it makes a difference,” said Behm. Not so much for the rest of us.

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Fitness

What Happens to Your Body When You Take Ozempic Without Exercising

Published

8 hours ago

March 25, 2026

Press Room

What Happens to Your Body When You Take Ozempic Without Exercising

(Photo: Oleg Breslavtsev / Getty)

Published March 25, 2026 12:36PM

Is exercise obsolete in the age of Ozempic? Now that the initial hype has settled down, nobody makes that claim with a straight face. In fact, one of the big fears among people taking GLP-1 agonists (the class of drug to which Ozempic belongs) is that they’ll lose too much muscle along with all the fat, leaving them weaker and less healthy. But at this point, there’s very little data on what happens when you combine these drugs with an exercise routine (or lack thereof).

A newly published study in the journal Sports Medicine steps into this gap. It’s a secondary analysis of data from a previously published study by researchers at the University of Copenhagen in Denmark, funded in part by the Novo Nordisk Foundation (Novo Nordisk is the company that makes Ozempic). The study follows volunteers taking another Novo Nordisk GLP-1 agonist called liraglutide (sold under the brand names Victoza and Saxenda) for an entire year, with or without the addition of a regular exercise program. The results show that without exercise, both health and physical function suffer—and it’s not just about muscle.

What the GLP-1 Study Found

The study involved 193 adults between the ages of 18 and 65. It’s a little unusual in that they started by following an eight-week very-low-calorie diet before starting either exercise or the GLP-1 drug. That’s because the original study was designed to look at ways of maintaining weight loss. Everyone included in the study lost at least 5 percent of their starting weight, which resulted in an average weight loss of 29 pounds. Then, for the following year, they either exercised, took the GLP-1 drug, did both, or did neither. (Those who didn’t get the drug got a placebo.)

The exercise program involved two group exercise classes per week, including 30 minutes of intervals on an exercise bike, then 15 minutes of circuit training (step-ups, boxing, squats, kettlebells, and so on). The subjects were also asked to do two additional workouts on their own; the details were up to them, but most chose running, cycling, brisk walking, or circuits. Adherence was decent: they averaged 2.65 workouts a week and met standard public health guidelines for physical activity.

The first outcome of interest (as reported in the original analysis) is weight. Here’s the trajectory of the four groups:

Graphing showing that the combination of exercise and a GLP-1 drug was most effective for maintaining weight loss. — The combination of exercise and a GLP-1 drug was most effective for maintaining weight loss. (Photo: Sports Medicine)

Doing nothing was the worst option. Exercising and taking a GLP-1 drug was the best option. If you had to choose one or the other, the drug looks marginally better, though the difference wasn’t statistically significant.

Does Fitness or Fatness Matter More?

There’s a longstanding debate about the relative health effects of being overweight versus being aerobically unfit. The two often go together, so they get conflated—but they’re not the same thing. The general trend of evidence, according to the Danish research team, is that it’s better for health and longevity to be fit and overweight than unfit and normal weight. This distinction is important in the context of GLP-1 drugs, because if they help you lose weight without gaining fitness, then the health benefits may be less than you’d expect.

Figuring out how to measure fitness in this context isn’t straightforward. When you lose weight, you’ll generally lose some muscle mass in addition to fat loss. Both strength and aerobic fitness (as measured by VO2 max) are roughly proportional to muscle mass, so your absolute fitness might appear to decline when you lose a lot of weight. But if you lose less strength or fitness in proportion to your overall weight loss, you’ll still end up with greater functional fitness: you’ll have an easier time getting up from a chair, be able to walk for longer, and so on.

One of the simple functional tests the Danish study included was a stair-climb test: climb up and down an 11-step stairway twice, as fast as possible. Here’s what those results looked like:

Graphing showing that the key to climbing stairs more quickly was exercise, with or without a GLP-1 drug. — The key to climbing stairs more quickly was exercise, with or without a GLP-1 drug. (Photo: Sports Medicine)

It’s clear here that the exercise program helped people speed up and down the stairs more quickly, whether or not they were taking the GLP-1 drug. Just taking the drug without exercising didn’t have any benefit.

There are a whole bunch of other fitness measures in the paper: VO2 max tests, leg strength tests, body composition tests to measure muscle mass in the arms and legs. The fitness outcomes can be expressed in absolute terms, or relative to total body weight, or relative to muscle mass. No matter how you express it, the overall pattern, with a few minor exceptions, is the same as the graph above: exercise makes you fitter, simply taking the drug doesn’t.

(An example of a minor exception: the drug alone was enough to improve relative leg strength, i.e. leg strength divided by total body weight, because weight decreased more than strength. But adding exercise worked even better.)

This conclusion—that the best way to get fitter is to exercise—is not exactly surprising. But I think it has been overlooked in discussions about GLP-1 drugs. I’ve certainly seen lots of chatter about the dangers of muscle loss with Ozempic, and the need to pound protein and lift weights. That’s a legitimate concern, but aerobic fitness is an even better predictor of longevity and marker of general health. GLP-1 drugs have remarkable properties, but they haven’t made exercise obsolete.

For more Sweat Science, sign up for the email newsletter and check out my new book The Explorer’s Gene: Why We Seek Big Challenges, New Flavors, and the Blank Spots on the Map.

Fitness

Stay on Top of Your Workouts and Health With the Best Fitness Trackers of 2026

Published

21 hours ago

March 25, 2026

Press Room

Stay on Top of Your Workouts and Health With the Best Fitness Trackers of 2026

Format: Would you prefer wearing a ring or a wrist-based device? If you want something understated that you can wear all the time and don’t mind not having a screen to glance at, then a ring would be ideal. If having a watch on your wrist is comfortable, then a smartwatch or wrist-based tracker may be the right choice.

Compatibility: If you’re an Apple user, ensure your fitness tracker is compatible with iOS. The same goes if you’re an Android user.

Storage capacity: For those who don’t want their fitness tracker to be dependent on their phone, look at a device with its own storage capacity.

Special features: Before purchasing a fitness tracker, consider the health metrics that are important to you for your favorite workouts. If you’d like your tracker to do more than monitor your fitness, you’ll be better off with a smartwatch like the Pixel Watch 4 or Apple Watch SE 3.

Wi-Fi or Bluetooth: If you’re the type of person who likes to leave their phone behind when working out but still needs internet access, ensure your fitness tracker has Wi-Fi.

GPS? For those who run, hike or walk and want to keep track of metrics like distance and pace without their phone, choose a fitness tracker that has built-in GPS.

Screen size: Once you decide you want a fitness tracker with a screen, make sure it fits your personal preferences. A smaller screen may be better if you prefer for it to be less obvious that you’re wearing a fitness tracker on your wrist.

Battery life: How often do you want to be charging your fitness tracker? If frequently charging your devices is a pet peeve, ensure your fitness tracker of choice has a long battery life, especially for your preferred workouts.

Water resistance: Individuals who work out by swimming or those who enjoy taking a dip in the pool after exercising will want a fitness tracker that is water-resistant. Confirm your device is rated for the depth you plan to swim at.

Subscription cost: It’s common for fitness trackers to come with the added cost of a subscription, particularly if you want to access all available features or require extra features for your workout or fitness goals. To guarantee that a fitness tracker is in your budget, check not only the price of the device, but also how much your subscription of choice will run you over the course of a year.

Fitness

Exercise First Thing in the Morning for Better Heart Health, Study Suggests

Published

1 day ago

March 24, 2026

Press Room

Exercise First Thing in the Morning for Better Heart Health, Study Suggests

If you typically work out in the morning, a new study suggests you may have a lower risk for high blood pressure, type 2 diabetes, obesity, and other contributors to heart disease compared with people who exercise later in the day.

“This study suggests that when you exercise may matter, not just how much you exercise,” says senior study author Prashant Rao, MBBS, a sports cardiologist and physician-scientist at Beth Israel Deaconess Medical Center and Harvard Medical School, both in Boston.

The research, which will be presented at the American College of Cardiology’s Annual Scientific Session later this month, relied on minute-level heart rate data from nearly 15,000 adults. Dr. Rao says this allowed his team to capture long-term, real-world exercise data with much more detail and accuracy.

Early Morning Workouts Are Linked to Better Cardiometabolic Health

The study analyzed health records and Fitbit heart rate data collected over a year. Researchers identified periods when participants had an elevated heart rate for 15 minutes or more to track physical activity. Then they grouped participants into categories based on the time of day exercise occurred.

Researchers compared these timing groups with health data including rates of high blood pressure, obesity, high cholesterol, atrial fibrillation, coronary artery disease, and other cardiovascular health problems. They adjusted the findings to account for differences in age, sex, income level, total activity level, sleep, alcohol use, and smoking status.

The results showed that compared with adults who exercised later in the day, those who worked out in the morning were:

These risk reductions were independent of how much exercise people actually got. Adults who exercised between 7 and 8 a.m. had the lowest odds of coronary artery disease.

Aubrey Grant, MD, a sports cardiologist at MedStar Health in Washington, D.C., who wasn’t involved with the research, says the results suggest that “timing may be a previously underappreciated lever in cardiometabolic risk reduction.”

He adds that wearable technology is giving scientists more granular exercise data, which “opens a more nuanced conversation about how physical activity interacts with the body’s daily rhythms.”

Exercise Timing Is a ‘New Frontier’

A main limitation of the research is that it’s an observational study, “so we can’t establish causality,” Rao says. Because participants weren’t randomized to exercise at different times, the results only show a link, not that earlier exercise directly leads to the observed health benefits.

“While we did our best to adjust for confounders [factors that could muddy the results], timing may still reflect differences in work schedules, socioeconomic factors, or lifestyle patterns that aren’t potentially fully captured in our analyses,” he says.

The link between exercise timing and health is a “new frontier in exercise science,” says Dr. Grant. For decades, research has focused on “how much and how hard” people worked out — variables that still matter, he says.

But more data on timing is starting to appear. Just this January, for instance, another published study found that older adults who identified as “night people” had worse cardiovascular health compared with adults who said they were “morning people.”

Why Exercise Timing May Lower Cardiometabolic Risk

“The honest answer is that we do not fully know yet” why this link is appearing, Grant says.

“Morning exercise may align better with circadian physiology,” or how bodily functions naturally correspond to the time of day, he says. “Cortisol peaks early in the day and can prime the body for physical exertion, potentially enhancing metabolic efficiency,” Grant adds.

Exercise is also a natural stimulant. When you work out early, it revs up your bodily systems and energizes you for the day, says Andrew Freeman, MD, director of cardiovascular prevention and wellness at National Jewish Health in Denver. Dr. Freeman was not involved with the new study.

People who work out earlier may also have healthier lifestyle habits, overall, says Alex Rothstein, EdD, an assistant professor of exercise science at the New York Institute of Technology in Old Westbury.

“If you work out earlier in the day, you tend to have fewer excuses to not work out,” and you may exercise more consistently, says Dr. Rothstein, who was not involved with the new research.

Should You Start Exercising in the Morning?

Freeman recommends getting 30 minutes a day of “breathless physical activity,” including a combination of cardio and strength training. But if you prefer to work out in the afternoons or have responsibilities preventing you from exercising in the morning, don’t worry.

“It does not mean people should feel guilty about evening workouts,” Grant says. “It means that when we counsel patients on optimizing their health, exercise timing is now a legitimate part of that conversation, alongside sleep, nutrition, and stress management.”

If you have flexibility, though, Rothstein suggests exercising in the morning, as it’s less likely that something will interfere with your workout later on, and it may offer extra heart health benefits.

“The most important message is still: Exercise consistently, regardless of timing,” Rao says. However, “Timing may represent a simple, low-cost way to potentially optimize health.”