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the morning Working out in the morning — especially on an empty stomach — is the best way to burn stored fat, making it ideal for weight loss.

time.com - This Is the Best Time of Day to Work Out, According to Science

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Finding time to exercise can be challenging, and the most important thing is to squeeze in any amount of it whenever you can. But if you want to optimize your workouts to get the widest range of benefits, you might want to try exercising in the morning. Here’s what the science says about the best time of day to exercise — and what to expect if you opt for later workouts.

Morning workouts have an edge

Working out in the morning — especially on an empty stomach — is the best way to burn stored fat, making it ideal for weight loss. That’s largely because the body’s hormonal composition in the morning is set up to support that goal, says Anthony Hackney, a professor in the department of exercise and sport science at the University of North Carolina Chapel Hill. “In the early morning hours, you have a hormonal profile that would predispose you to better metabolism of fat,” Hackney says. People naturally have elevated levels of cortisol and growth hormone in the morning—both of which are involved in metabolism—so you’ll “draw more of your energy from your fat reserves,” Hackney says. That can potentially help with weight loss. Research also suggests that morning exercisers may have less of an appetite throughout the day, which could also help protect them from putting on pounds. Even if you hate early alarms, working out first thing in the morning can quickly become second nature. A study published in 2019 in the Journal of Physiology found that exercising at 7 a.m. may shift your body clock earlier, meaning you’ll feel more alert in the morning and get tired earlier in the evening, potentially priming you to get enough rest to wake up and do the same thing the next day. Some research even suggests that it’s easier to stick to healthy habits completed in the morning. A morning sweat may also lead to better mental health and productivity throughout the day, since exercise is great for reducing stress. But if you’re really not a morning person, don’t force it. “You may be exercising, but it may be at such a low intensity level that you’re really not expending a lot of energy,” Hackney says. Get our Health Newsletter. Sign up to receive the latest health and science news, plus answers to wellness questions and expert tips. Please enter a valid email address. * The request timed out and you did not successfully sign up. Please attempt to sign up again. Sign Up Now An unexpected error has occurred with your sign up. Please try again later. Check here if you would like to receive subscription offers and other promotions via email from TIME group companies. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Service and Privacy Policy Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

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Afternoon workouts are almost as good

If you can swing a lunchtime workout, Hackney says that’s not a bad second choice — especially if you’re trying to do a very long or rigorous routine.

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Morning workouts are ideal for burning fat and losing weight, but afternoon workouts may give your performance a boost, since you’ll have eaten a meal or two by the time you get going. “Any time you eat, your blood sugar levels rise,” Hackney says. “Sugar in the form of blood glucose…is one of the things we need if we’re trying to work at a higher intensity.” An afternoon workout can also be a great way to avoid an end-of-the-day slump. The Journal of Physiology study found that exercising between 1 p.m. and 4 p.m. can shift forward your body clock in the same way as an early morning workout. Even taking a quick walk may help you perk up and refocus. One preliminary paper from 2018 found that your body naturally burns about 10% more calories in the late afternoon, compared to the early morning and late night. The researchers looked at bodies at rest — so they can’t draw firm conclusions about what happens when people work out — but it’s possible that you could burn a little extra energy if you move in the afternoon.

Nighttime workouts still come with perks

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For many people, exercising is most convenient after work. But there’s a common belief that evening exercise perks you up so much that it’s difficult to fall asleep later. While the Journal of Physiology study found that exercising between 7 p.m. and 10 p.m. delays the body clock, translating to later bedtimes, Hackney says he’s not convinced that’s the case. “Evidence suggests that, as long as you’re not exercising, showering and then [immediately] jumping in bed to go to sleep, it doesn’t interfere with your sleep pattern at all,” he says. A stress-relieving activity like yoga may even help you sleep better if it’s done at night, he adds. And while the research about morning workouts and weight loss is more established, some evidence suggests that nighttime workouts can also set people up for weight loss. A 2019 paper published in the journal Experimental Physiology found that nighttime workouts do not disrupt sleep, and over time can also reduce levels of the hunger-stimulating hormone ghrelin, which could help with weight loss or management.

The bottom line

If he had to pick a best time to exercise, morning would win, Hackney says. Early workouts make the most of your biology and psychology, potentially leading to better results and adherence over time. But there’s really no bad time to exercise, Hackney reiterates, and the most important thing is finding the time to do so, whenever works for you. “If you will do it in the morning, do it. If you will do it in the evening, do it,” Hackney says. “If your physiology is not going to match up with your behavior, then it’s a moot point.”

Write to Jamie Ducharme at jamie.ducharme@time.com.

time.com - This Is the Best Time of Day to Work Out, According to Science

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