Fitness
How does your smart watch or fitness tracker compare to a gold-standard physiology test?
Dr Richard Alcock’s lungs feel like they’re exploding, but he has to keep pedalling.
A mask is strapped tight to his face to capture every breath he manages to squeeze out over 15 minutes of increasingly intense cycling.
A physiologist is pushing Dr Alcock to his limit: “Treat it like a finish line!”
He manages to respond with only a grunt, and a nod.
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He’s testing the maximum amount of oxygen his body can use — his VO2 max — the gold standard indicator of cardiovascular fitness.
All this effort achieved a reading of 62.5 mL/kg/min — it puts Dr Alcock, who works as a cardiologist, close to the Olympic level for his age and gender.
His smart watch shows a reading of 56 mL/kg/min, about 10 per cent off.
Do smart watches give accurate readings?
The difference between the two readings in Dr Alcock’s test is the smart watch hasn’t actually measured his oxygen output.
It estimated the number, based on heart rate and speed.
Smart watches are sold as an easy and accessible way to track your health and fitness, but even the best smart watch falls short of the accuracy required in most medical and scientific settings.
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A Spanish study published in 2023 found heart rate readings varied significantly depending on exercise intensity, and whether a subject was moving their arms — for example, cycling versus running.
Another study found wearables overestimate sleep because they depend on body movement – but noted accuracy was improving compared to older models.
Smart watches generally struggle to accurately track metrics like blood pressure and the quality of your sleep.
Step count is relatively accurate among most wearables, and can quite reliably measure how far you’ve run under optimal conditions.
However, errors can compound when devices rely on one reading to calculate another, like using your step count to calculate how many calories you’ve burned.
Are smart watches good for your health?
More than 36 per cent of Australians own a smart wrist wearable, according to a 2023 Telsyte market study.
While they have niche medical uses — like detecting an abnormal heart beat, or atrial fibrillation —they’re primarily marketed as general health and fitness trackers.
Dr Alcock believes smart watches help motivate people to be more active.
“Every day use for the general public, they’re great … I think it’s getting people exercising simply by having the watch.”
Many elite level athletes have also adopted them into their arsenal of tools to help maximise performance, according to Edith Cowan University Professor of Human Performance Sophia Nimphius.
“Elite athletes have a very specific training environment, how much training they’re doing, everything is prescribed,” she said.
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That strict environment is why Professor Nimphius believes smart watches and fitness trackers are more beneficial to athletes, rather than the average user.
“The general consumers’ daily training environment is quite dynamic and ever changing,” she said.
“When we’re thinking about the accuracy of something, a lot of people might think, oh five to 10 per cent [off], that’s pretty good.
“We start taking literal, small changes that might be in that margin of error as if it’s a truth — that’s where we run into some issues.
“Some of the measure and metrics of wearables can be as accurate, or inaccurate, as 50 per cent off.”
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Professor Nimphius suggests relying on trends in your data over time, rather than obsessing over your daily figures.
However, even then, she warns fitness trackers don’t work for everyone as a health and fitness tool.
“Their watch says maybe they’re having a bad day, or they didn’t sleep well, independent on whether they actually feel that’s true,” she said.
“There’s a psychological component to fully trusting and investing in a number on your watch.”
Where does all your data go?
Professor Nimphius uses a smart watch herself, but urged consumers to be aware of how companies are using their data.
“It’s got our heart rate, it’s got sometimes respiratory rate, it’s got when we are sleeping and how much,” she said.
“All of that information when tied together can really say some intimate things about you.”
She said fitness data tracked by wearables, and other technology, doesn’t have the same regulation as other medical or health records, which leaves it open to misuse.
“We have to start considering whether the combination of all these bits of information of our physiology is indeed health information,” she said.
“If we thought that this was medical data, would we accept that?”
Fitness
Ohio State conducts research study about exercise and improving mental health
Training session with a student participant of the Exercise is Medicine™ for Student Resilience research study. Credit: Courtesy of Carmen Swain
The College of Education and Human Ecology is exploring how physical activity can improve students’ mental health.
The college is partnering with Wilce Student Health Center and Student Life Recreational Sport to conduct the study called “Exercise is Medicine™ for Student Resilience” to implement structured exercise into students’ lives.
The study targets those who aren’t active or are stressed to help enhance their mental health and resilience, Carmen Swain, director in health and exercise science and principal investigator of the study, said.
“Our main mission is to try to impact mental health and college students, that’s our goal,” Swain said.
The program is led by trained undergraduate students who work as research assistants or personal trainers. The fitness coaches meet weekly with student participants for nine weeks to do exercise sessions, Swain said.
Participants are required to wear a fitness tracker called a “WHOOP” that measures their health and fitness data throughout the program, Swain said.
“It measures a lot of your biometric data,” Swain said. “So, it measures your heart rate, your sleep and it’s pretty cool.”
The fitness tracker also helps researchers monitor participants’ stress levels to see if they are decreasing throughout the study, Jean-Pierre Khouzam, a second-year master’s student in kinesiology and research lead for the study, said.
“I like to call it a nicer Apple Watch,” Khouzam said. “Never take it off, you charge it on your wrist and it gives you a lot of insights. A lot more insights than just a normal Apple Watch would give you.”
Researchers also conduct pre- and post-testing to measure the changes in the students’ physical fitness and mental health status, Swain said.
Part of the testing is having participants take surveys that score measures like depression and loneliness, Swain said.
“The goal of the program is to see if the physical fitness programming led by these peers impacts their scores on these surveys,” Swain said.
The research is especially relevant now because many Ohio State students are struggling with high levels of anxiety, depression and loneliness, Swain said.
“Mental health is a crisis, especially for college students,” Swain said.
Many studies show that exercise can improve mental health, which is why the research study was developed, Khouzam said.
There are currently seven students participating in the study, and the goal is to have 20 participants by the end of the next semester, Khouzam said.
He hopes the undergraduate leads will gain valuable skills from the experience and see the impact they are making on others, Khouzam said.
“Hopefully they have an impactful experience to where they understand what research is about,” Khouzam said. “And then also they’re helping other people, which is huge in my eyes.”
Fitness
Should You Exercise In The Morning Or Evening? Deepika Padukone’s Trainer Weighs In
Last Updated:
Yasmin Karachiwala, who has trained Deepika Padukone and Alia Bhatt, revealed if one should work out in the morning or evening for best results.
Consistency is more important than workout timing.
For anyone trying to stay fit, finding time to exercise often feels like the biggest workout of all. Between work meetings, social plans, and family responsibilities, sticking to a consistent routine can be challenging. And amid all the wellness advice flooding social media, one debate never seems to end – what’s the best time to exercise: morning or evening?
Celebrity fitness trainer Yasmin Karachiwala, who has shaped the physiques of stars like Deepika Padukone, Katrina Kaif, Alia Bhatt, and Preity Zinta, recently reignited the conversation. She asked her followers a simple but relatable question: “Are you team Morning or team Evening?”
Why Timing Matters Less Than Consistency
According to Yasmin, there’s no universal ‘best’ time to work out. It’s about what fits you. Morning workouts appeal to early risers who enjoy starting their day on an energising note. Exercising first thing can boost mood, metabolism, and mental clarity. But for others, evenings are when their body feels warmer, stronger, and more flexible, making strength or endurance workouts more effective.
Food timing is another key factor. Some prefer training on an empty stomach, while others need a light pre-workout meal for an energy lift. And then there’s environment – some thrive in the hustle of a busy gym, others focus better in quieter spaces. Yasmin’s take: it’s about listening to your body’s rhythm, not forcing it into someone else’s routine.
The Power Of Showing Up
What truly defines success, Yasmin insists, is consistency. Whether it’s 6 a.m. Pilates or a 7 p.m. spin class, regularity beats perfection. “The best time is whenever you can stay consistent and enjoy it,” she emphasises. Her approach, honed over decades of training Bollywood’s fittest, prioritises longevity over quick fixes. Workouts are tailored not just for aesthetics but for balance by improving posture, flexibility, and mental wellness alongside strength.
Fitness That Fits Your Life
For those still caught between sunrise runs and post-work gym sessions, Yasmin’s advice offers freedom: stop overthinking the clock. What matters most is that your workout feels sustainable and enjoyable.
In a world obsessed with trends, her philosophy cuts through the noise. Fitness isn’t about finding the perfect hour; it’s about showing up, every day, in whatever hour works for you.
Delhi, India, India
October 29, 2025, 09:03 IST
Fitness
Scientists just debunked a popular exercise myth and the truth might surprise you – Metabolic
You’ve probably heard the claim that too much exercise “uses up” your heartbeats, as if the heart were a battery with a limited charge. New research says the opposite is true. A fit heart actually beats less over time, making each beat more efficient and possibly adding years to your life.
A team from Australia’s Victor Chang Cardiac Research Institute and the St Vincent’s Institute of Medical Research found that physically active people use fewer total heartbeats per day than those who are sedentary. Here, we’ll look at what the researchers discovered, how it challenges a long-standing health myth, and what it means for your heart, longevity, and fitness habits.
Exercise myth debunked: the truth about heartbeats
The study, published in JACC: Advances, compared the daily heart activity of trained athletes and inactive adults. The difference was striking. On average, athletes’ hearts beat about 68 times per minute, while non-athletes clocked in around 76. Over 24 hours, that’s roughly 97,920 beats for the active group and 109,440 for the inactive—a savings of more than 11,000 beats a day for fitter individuals.
Professor Andre La Gerche, head of the HEART Laboratory at the Victor Chang Cardiac Research Institute, explained that this efficiency is what sets a fit heart apart. “Even though athletes’ hearts work harder during exercise, their lower resting rates more than make up for it”, he said. In other words, your heart doesn’t wear out from regular workouts—it gets stronger and smarter.
Participants with the highest fitness levels had resting heart rates as low as 40 beats per minute, compared to the typical 70–80 bpm seen in most adults. Despite bursts of intense activity, their total daily heartbeats remained lower overall. This finding directly challenges the old “finite heartbeats” theory that exercise depletes the body’s limited energy supply.
“The fitter you are, the more metabolically efficient your body becomes”, La Gerche said. “Even if you’re training hard for an hour a day, your heart beats more slowly for the other 23 hours”. That lower resting rate is linked with better cardiovascular function, reduced disease risk, and longer lifespan.
The biggest improvement, according to La Gerche, comes from going from unfit to moderately fit. Just a few hours of regular activity a week can make a measurable difference in how efficiently your heart works.
Other exercise myths worth forgetting
Here are a few other common misconceptions that science continues to dismantle:
- You have to work out hard every day to see results. Rest and recovery are part of training. Muscles repair and strengthen when you give them time to recover.
- Cardio is all you need for heart health. Strength training, mobility work, and flexibility exercises also support heart function and metabolic health.
- Morning workouts are always better. The best time to exercise is when you can do it consistently.
- Sweating means you’re burning more calories. Sweat is about cooling your body, not a measure of fat loss or workout effectiveness.
Exercise doesn’t burn through your heartbeats—it helps you use them wisely. A strong heart beats slower, lasts longer, and keeps you healthier. Fitness is about training your body to use it efficiently.
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