Fitness
Smarter, safer workouts with a wearable fitness tracker – Harvard Health
Do you need a little extra inspiration to be more active throughout the day? Or perhaps you’re wondering if your workouts are challenging enough to optimize your cardiovascular health. And if you have any type of heart disease, you’ll want to be sure you’re not pushing yourself too hard during vigorous physical activity. For each of these situations, a wearable fitness tracker may be a worthwhile investment, especially when you consider that exercise is widely considered the best medicine — not just for your heart but for your overall health.
You may already own such a device, as most smart watches include a range of fitness tracking features alongside their other functions. Other options include wrist-worn bands and smart rings that focus primarily on health and fitness tracking.
“The information these wearables provide is measurable, meaningful, and motivating,” says Dr. Sawalla Guseh, director of the Cardiovascular Performance Program at Harvard-affiliated Massachusetts General Hospital. “It’s like having a goal-setting coach with you around the clock,” he says.
Long-term monitoring may also alert you to heart problems, says Dr. Guseh. “I had one patient who didn’t feel chest pain or related symptoms, but he noticed his exercise performance declining over time. It turned out he had coronary artery disease,” he says.
Features to watch
Here are some of the features on wearable fitness devices that are worth checking out.
Stand or move reminders. Many wearables feature customizable notifications — a message on the watch face or a sound or vibration — to remind you to stand up and move around for a short period of time to break up long stretches of sitting. Even dedicated runners need to avoid being sedentary throughout the day to keep their hearts healthy, says Dr. Guseh (see “Stand up for your heart” in the June 2025 Heart Letter).
Daily step counts. Although you’ve likely heard that 10,000 steps per day is a good goal, that number was based on a Japanese marketing scheme and not actual data. Recent evidence finds that a lower number — anywhere from 4,000 to 7,000 daily steps — is linked to improved heart health. A smartphone (provided you carry it with you most of the day) can give a close estimate of your daily step count, but a wearable will be more accurate. Data from your smart watch automatically syncs with your smartphone, and most have apps that display trends in your step counts and other exercise data over weeks, months, and years.
Heart rate zones. Wearables make it easier to assess your exercise effort with heart rate zones, which classify how intensely you’re exercising by measuring your heart rate. The zones are based on your maximum (or peak) heart rate (MHR) — an estimate of the upper limit of what your cardiovascular system can handle during physical activity. A commonly used formula for MHR is 220 beats per minute minus your age, but you should consider this a ballpark figure, since factors other than age are at play.
Different wearables have varied numbers of heart rate zones, although five is typical. Zones 2 and 3 are generally thought to correspond to moderate-intensity exercise, while zones 4 and 5 correspond to vigorous-intensity exercise. But because they’re not individualized, they may not be accurate for everyone, Dr. Guseh notes. Ideally, you should do at least 150 minutes of moderate-intensity exercise, or 75 minutes or more of vigorous-intensity exercise, or an equivalent combination every week.
Heart rate recovery (HRR). This value reflects your heart’s ability to return to its normal, resting pace after you stop exercising. It’s the difference between your peak heart rate during exercise and your heart rate at a set time after you stop (typically one to two minutes). A value of 20 beats per minute is considered good, and higher is even better.
Maximal oxygen consumption (VO2 max). This value is the maximum amount of oxygen a person can use during intense exercise. It can be measured directly when a person runs on a treadmill with an oxygen mask in a lab. Some wearables estimate it based on an algorithm that uses data such as your MHR, HRR, pace, weight, and sex. VO2 max is a powerful predictor of cardiovascular health. “The absolute number may not always be accurate, but the trends can be useful. If your VO2 max rises over time, that’s a strong sign your training is improving your fitness,” says Dr. Guseh.
Heart rate variability (HRV). This value is a measure of the variation in time between heartbeats — differences that are just fractions of a second. More variability (a higher value) suggests better heart health, because it reflects the heart’s ability to respond quickly to rapid changes occurring throughout the body. Most wearables report this value, but there isn’t a recommended target because it varies widely depending on your age, sex, fitness level, and medical history. However, it can be useful to track trends in your HRV over time. HRV often falls after a period or stress or illness but then bounces back — a sign that you’re good to go back to exercising, says Dr. Guseh.
Exercising after a heart disease diagnosis
Anyone who’s had a heart attack, heart surgery, or other heart disease diagnosis should attend cardiac rehabilitation, a personalized program of supervised exercise and heart-healthy lifestyle coaching. It starts with an exercise stress test, which involves closely monitoring your heart during exercise to tailor an effective yet safe exercise program for you.
“Cardiac rehab is a tried-and-true method of helping people get back into shape, with a standardized protocol that works well for most people,” says cardiologist Dr. Sawalla Guseh, assistant professor of medicine at Harvard Medical School. However, people who were previously exercising at higher intensities and therefore quite fit may get bored at cardiac rehab because it’s too easy for them, he says. If that’s the case for you, consider requesting a referral to a sports cardiologist, who can provide more rigorous and detailed testing and advice, including a specific heart rate threshold you should be careful not to exceed.
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Image: © Oscar Wong/Getty Images
Fitness
Alexandra Daddario, 40, relies on this underrated crunch upgrade for strong abs – here’s how to do it properly
From enduring some serious physical prep for Baywatch to working consistently with elite trainer Patrick Murphy, Alexanda Daddario’s dedication to fitness is well-documented. She often shares insights on social media, and in a recent Instagram post, the White Lotus star gave an insight into how she trains her core with one powerhouse movement: the reverse crunch into shoulder stand.
Why is it so good? Most traditional ab exercises require repetitive spinal flexion – the process of pulling your chest down toward your knees, like in a standard crunch. This isolates only the upper section of your abs, and for women who spend hours sitting at a desk, it can reinforce a slouched, rounded posture.
Daddario’s movement flips the mechanics entirely since you actively curl your pelvis up toward your chest. In doing so, you target not only your upper abs, but the lower portion and your obliques (the sides) simultaneously, all while keeping your chest open and your neck unstrained. This translates into a much stronger core, better posture and crucial lower back protection. Research also shows that a controlled posterior tilt – the lower-body curl that initiates Daddario’s move – recruits a significantly higher percentage of deep core muscle fibres than traditional crunches.
Daddario then drives her hips directly up into a vertical shoulder stand. This completely removes momentum from the equation (meaning you can’t “cheat”) and forces your abs – particularly your obliques – to balance your body and prevent you from tipping sideways.
She then takes it one step further into a Pilates plow position with her legs overhead, before reversing the movement and, again, using her abs to control the lowering of her entire lower body as she slowly unrolls her spine down onto the mat. The plow portion is optional (and super advanced); the slow, controlled, lowering phase, which happens whether you move into plow or not, is where the magic happens, challenging your core through both lifting and resisting gravity. Inspired? Here’s exactly how to do the move with good form, and how many reps and sets to aim for.
How to do a reverse crunch into shoulder stand
- Lie on your back (either on a mat, or on a reformer Pilates machine, like Daddario, with your arms anchored tightly to the floor.
- Engage your core to curl your knees toward your chest, then fluidly press your feet straight up toward the ceiling, lifting your hips and lower back off the floor.
- Slowly lower down, one vertebra at a time. Aim for 3 sets of 6-8 controlled reps.
Optional progression:
- As you reach shoulder stand with your legs extended to the ceiling, slowly start to lower your toes toward the floor over your head. Your weight should rest entirely on your shoulders and upper back – not your neck.
- Keeping your legs straight, use your core to extend them straight back up to the ceiling, then control the descent by rolling your spine down one vertebra at a time, with your legs remaining straight.
One of our most frequently asked questions here at Women’s Health? How to build muscle and burn fat at the same time. So, we asked superstar trainer Oyinda Okunowo exactly how to do it. In this 4-week plan – created exclusively for Women’s Health COLLECTIVE members – you’ll get the workouts and nutrition guidance needed to help you on your way to better body composition. Tap the link below to unlock 14 days of free access to Oyinda’s plan and start training today.
GET THE PLAN
As Women’s Health UK’s fitness director and a qualified Pilates and yoga instructor, Bridie Wilkins has been passionately reporting on exercise, health and nutrition since the start of her decade-long career in journalism.
After earning a first-class degree in journalism and NCTJ accreditation, she secured her first role at Look Magazine, where she launched the magazine’s health and fitness column, Look Fit, before going on to become Health and Fitness writer at HELLO!
Since, she has written for Stylist, Glamour, Cosmopolitan, Marie Claire, Elle, The Metro, Runner’s World and Red. Today, she oversees all fitness content across Women’s Health online and in print, spearheading leading cross-platform franchises, such as ‘Fit At Any Age’, which showcases the women proving that age is no barrier to exercise.
She has also represented the brand on BBC Radio London, plus various podcasts and Substacks – all with the aim to encourage more women to exercise and show them how. Outside of work, find her trying the latest Pilates studio, testing her VO2 max for fun (TY, Oura), or posting workouts on Instagram.
Fitness
Built Strong: Fitness forges unbreakable father-son bond
Fathers often share special bonds with their children. For 80-year-old Chanka Ramrattan, that bond is a shared love for fitness and exercise with his 46-year-old son Nari.
The Rousillac resident recalled that he began exercising at the age of 14, lifting weights and taking long walks, a passion that remains with him today. During his time working as a clerk at Texaco, he said he would walk from Forest Reserve to his Rousillac home, a distance of approximately 12 kilometres.
“I have done every marathon in Trinidad; you name a marathon, I could tell you. Miami Marathon, Tobago Sea-to-Sea, which is the most difficult marathon that I’ve ever done. I even have a trophy where I got the fastest speed walking man, and I have all my medals,” he recounted.
Chanka’s last marathon was a virtual one in 2021. Since then, his doctor has advised him to slow down because of his age. Now, he spends his time at the Health and Fitness Gym in Debe and South Oropouche about three times a week, walking marathons of his own on the treadmill.
“I do cardio walking for one hour, and I do weight training for one hour. Then, I go in the sea and I swim and dive for one hour,” he noted.
Chanka firmly believes regular exercise has contributed to his longevity and said he plans to keep going.
“Exercise is very important, and I like exercise. You go to Miami, and you’ll see 90-year-olds and 100-year-olds in the gym, walking, and even going to marathons. That’s because if you don’t exercise, you feel lethargic, you feel down. And you also have to read a lot. So, you exercise the brain, and you exercise the body,” Chanka advised.
His son Nari believes that perseverance was one of the most important lessons his father passed on to his children, along with a love of fitness and exercise.
“When you are looking at your dad, and your mom, and you are seeing them exercising and you are seeing them fit, why would you not want to do the same thing? So, it was instilled in all of us, myself and my two siblings. That exercising became a routine. My bigger sister, she would run, and my smaller sister would do cardio,” Nari explained.
The engineer and businessman recalled starting to exercise and lift weights with his father and uncle from a young age, crediting the experience with shaping the discipline and fitness mindset he still follows today.
However, in 2016, he faced a big obstacle after he hit his head during a diving accident, damaging his C6 and C7 vertebrae and spinal cord.
“I was 37 at the time when I got into the accident. I lost all feeling in my body. The person that you see in front of you now is not the person I was three years ago. I actually couldn’t move at all; I could only move my toe. It took a lot of hard work and will, to come out of that situation. Eventually, I started to transfer from my wheelchair to a bed, to a car. I even built a machine for me to stand up with a harness, and it pulls me up in the air so I can stand up straight. So, I used that for two years to get my body back to where it is,” Nari explained.
Nari, who is currently a quadriplegic, said he was only able to make progress through persistence and support from his loved ones. Chanka admitted that period was one of the most difficult experiences of his life as a parent.
“I wouldn’t like to explain that, that is a different thing altogether. He was in Mount Hope for six months, we had to go every day. It was a real trying thing, but you know, he is on the way to recovery. His mother wants to see everything good for him. For me, she will treat me second class and she will treat them first class, and she is right. Because the ones that are able to walk, you give them less attention because they are tending to themselves. You have to give more attention to the one that needs attention,” he acknowledged.
But their bond through exercising didn’t change. During COVID-19, Nari said his father returned to weightlifting under his son’s guidance.
“When my dad was trapped in the house and he couldn’t go anywhere, he was very miserable. So, we had a schedule where he and I would use the weights that I have at home, and I would tell him what to do. He actually got a six-pack during COVID. So, we stayed home and exercised with my wife and all too. After, I realised now I could start back to go to gym,” Nari reflected.
Chanka said his son’s determination continues to inspire him.
“When you see somebody who is a bit incapacitated and they’re exercising, they give you inspiration. Like if that man could do that, I could do that too. I wish Nari all the best. He is adhering to all his exercises, and he has a will that you won’t get in your next life. It’s probably my genes passed on to him,” Chanka shared.
Nari said none of that would have been possible without his father’s influence.
“Dad, I just want to tell you, thank you very much for being in our lives. You give us the encouragement to go day to day, and just keep being who you are, because you have a strong will, strong mind, and that is what keeps us going every day,” he said.
Fitness
Angela Rippon, 81, reveals the one exercise she never skips for strong legs: ‘I do it every morning without fail’
At 81, Angela Rippon is one of the UK’s most energetic and active broadcasters. A long-time advocate for movement, the former ballet dancer has often credited simple, consistent habits with helping her stay strong, mobile and independent as she gets older. And among her daily rituals is one surprisingly simple exercise she swears by: pliés.
‘I’ll do 20 pliés in the morning, because that’s really good for your balance, your knees, your posture, your core strength, for everything,’ she told Good Housekeeping. ‘Ballet is a wonderful thing for keeping your legs in good shape. It builds the right muscles in your calves and thigh. I go to class whenever I can. I’m a great advocate for dance being the best form of exercise for your mind and your body.’
Pliés are an easy move that require no equipment and Rippon’s 20 reps take less than a minute to do, yet experts agree that they can offer a host of benefits, from improving balance and posture to building lower-body strength and supporting healthy joints. As Women’s Health Fashion Editor and dance instructor Isabelle Knevett says, ‘Plies strengthen the legs, glutes and inner thighs simultaneously. They also require core activation in order to maintain an upright posture, which helps train your balance and stability.’
Research backs Rippon’s morning habit, too. A 2024 study found that a 10-week classical ballet programme improved lower-body strength and physical function in women over 50, suggesting ballet-inspired movements may help support mobility and independence as we age.
And Angela has one more non-negotiable within her morning routine: stretching. ‘I do it every day without fail. Even if I’m on a really tight schedule and in a very small hotel room. Think about a cat. A cat might sleep for five hours, but when they get up, they stretch absolutely everything. I feel that after I’ve been sleeping, that’s what I need to do to get everything moving again.’
As for its benefits for longevity, a recent study published in the Scandinavian Journal of Medicine & Science in Sports found that greater flexibility was associated with a lower risk of early death, while other research found that a 10-minute at-home stretching routine can counteract significant decreases in strength, flexibility and jumping performance caused by low physical activity levels. Consider us influenced.
One of our most frequently asked questions here at Women’s Health? How to build muscle and burn fat at the same time. So, we asked superstar trainer Oyinda Okunowo exactly how to do it. In this 4-week plan – created exclusively for Women’s Health COLLECTIVE members – you’ll get the workouts and nutrition guidance needed to help you on your way to better body composition. Tap the link below to unlock 14 days of free access to Oyinda’s plan and start training today.
GET THE PLAN
As Women’s Health UK’s fitness director and a qualified Pilates and yoga instructor, Bridie Wilkins has been passionately reporting on exercise, health and nutrition since the start of her decade-long career in journalism.
After earning a first-class degree in journalism and NCTJ accreditation, she secured her first role at Look Magazine, where she launched the magazine’s health and fitness column, Look Fit, before going on to become Health and Fitness writer at HELLO!
Since, she has written for Stylist, Glamour, Cosmopolitan, Marie Claire, Elle, The Metro, Runner’s World and Red. Today, she oversees all fitness content across Women’s Health online and in print, spearheading leading cross-platform franchises, such as ‘Fit At Any Age’, which showcases the women proving that age is no barrier to exercise.
She has also represented the brand on BBC Radio London, plus various podcasts and Substacks – all with the aim to encourage more women to exercise and show them how. Outside of work, find her trying the latest Pilates studio, testing her VO2 max for fun (TY, Oura), or posting workouts on Instagram.
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