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Smarter, safer workouts with a wearable fitness tracker – Harvard Health

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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.

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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.

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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.

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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.

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“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.



Image: © Oscar Wong/Getty Images

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HFA Submits Comments to USTR Regarding Trade Policy – Health & Fitness Association

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HFA Submits Comments to USTR Regarding Trade Policy – Health & Fitness Association

HFA urges targeted trade policies to protect the fitness industry.

This week, HFA submitted comments to the Office of the US Trade Representative (USTR) on two important trade policy dockets that could have significant implications for exercise equipment manufacturers, suppliers, and fitness facility operators. 

Section 301 Tariff Proceeding
USTR sought comment on proposed tariffs from its Section 301 forced labor investigation, including possible product exclusions based on domestic availability and economic impact.

HFA submitted comments that advocated excluding exercise/rehabilitation equipment and critical components, citing irreplaceable global supply chains and the industry’s role in public health, chronic disease prevention, and military readiness.

US- China Board of Trade

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USTR proposed a new Board to identify non-sensitive products for reciprocal tariff reductions with China.

In comments submitted to USTR, HFA recommended designating exercise equipment as “non-sensitive” and eligible for negotiation, prioritizing products that boost US manufacturing and affordability, and setting criteria recognizing public health, productivity, and military readiness benefits.

The HFA thanks member operators, manufacturers, and suppliers whose data strengthened these submissions. Your efforts are helping HFA advocate for trade policy that supports the fitness industry.

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UnitedHealthcare rolls out wellness spending accounts for fitness, family planning

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UnitedHealthcare rolls out wellness spending accounts for fitness, family planning
The payer group said the new Lifestyle Spending Account will pay for the things not currently covered by other flexible spending accounts, such as consumer products to monitor nutrition and manage diabetes. The full list of options is presented in a new webstore.
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Are Stamina and Endurance the Same Thing?

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Are Stamina and Endurance the Same Thing?

Athletes need to think about stamina and endurance all the time. Whether you’re a runner, a basketball player or a swimmer, your ability to push hard and keep going often determines who wins and who comes out on top.

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But endurance and stamina aren’t just important for athletes. They can also affect how easily you tackle everyday activities, like yardwork or helping a friend move.

Exercise physiologist Christopher Travers, MS, explains what sets stamina and endurance apart and how to build up both with a variety of workouts.

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How stamina and endurance work together

Stamina and endurance often go hand in hand — but they’re different.

Think of stamina as how hard you can push yourself, and endurance as how long you can maintain that effort.

In car terms, stamina reflects how hard you push on the gas pedal for a quick jump in speed. Endurance reflects how far you can go before running out of fuel.

Together, they help you reach your destination and achieve milestones in your physical performance.

Let’s dig a little bit more into what makes each unique.

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What is stamina?

Stamina describes your mental and physical ability to sustain high-intensity effort over a shorter period of time. It’s that quick burst at the starting line, the second-wind sprint you get during the last push of a marathon and the fast acceleration that carries you uphill.

“With stamina, you’re trying to push through at a higher heart rate,” says Travers. “It’s your power, your speed and your repeated burst of effort.”

What is endurance?

Endurance describes your body’s ability to sustain low-to-moderate-intensity activity over very long periods of time. It’s the ability to endure a marathon, miles of cycling and long workout sessions without stopping or decreasing intensity.

“With endurance, you’re learning how to maintain a certain level of intensity for the longest period of time,” says Travers. “You’re focused on your breathing, keeping a steady pace and sticking to correct form so you can go longer without running out of energy.”

How to increase endurance and stamina

Building stamina and endurance involves different approaches to physical fitness. Stamina relies on quick bouts of high-intensity exercises, while endurance is less intense but for longer periods of time.

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Working on both simultaneously can improve your performance and make a significant impact on your overall health. Let’s now focus on each one individually.

How to increase stamina

Circuit training is a great way to build stamina because it combines strength and cardio exercises with limited rest. A circuit involves moving through a series of exercises that target different muscle groups with little-to-no break between each one. After completing a circuit, you take a longer recovery before repeating the entire circuit.

“The big thing with stamina workouts is your recovery,” notes Travers. “When you finish an entire circuit made up of several quick exercises, you want a longer recovery so you can come back and do the entire circuit over again at the same high intensity.”

High-intensity interval training (HIIT) can also improve stamina. HIIT alternates short bursts of intense exercise with brief recovery periods, training your body to:

  • Work hard even when you’re fatigued
  • Recover quickly between exercises
  • Tolerate higher levels of exertion
  • Use oxygen more efficiently

A stamina workout might combine these approaches by using a circuit of high-intensity exercises followed by a longer recovery period before repeating the circuit.

Exercises commonly used in stamina workouts include:

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  • Hill sprints
  • Box jumps
  • Stair climbs
  • Mountain climbers
  • Jump squats
  • Burpees

How to build endurance

To build endurance, you’ll need to learn how to maintain a certain level of intensity for longer stretches of time.

“With endurance, we’re going for that longer, steady state and gradually increasing our time and our distances,” explains Travers. “Endurance requires consistency over weeks and even months.”

It helps to focus on workouts that keep your body moving for extended periods. Cardiovascular exercises are especially effective at building endurance. But strength training can be adapted to improve muscular endurance, training your muscles to work longer before they become fatigued.

When working on endurance, you want to increase the amount of time, distance or reps as you progress through your training.

Common exercises for endurance include:

  • Cycling
  • Running
  • Hiking
  • Swimming
  • Rowing
  • Planks

Final note for the miles ahead

Whether your goal is to move faster, exercise longer or simply keep up with the demands of daily life, stamina and endurance can help you get there. Building both takes consistency and practice. But over time, those efforts can pay off in improved performance, better fitness and greater confidence in what your body can do.

“If you train consistently and you’re seeing progress, both your stamina and endurance are improving,” encourages Travers. “It doesn’t happen overnight. It takes time, practice and attention to your overall health.”

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