March 22, 2023

Best fitness Tracker

a Healthy Lifestyle for a Better Future


3 min read

EVERYONEDOCTORS, SCIENTISTS, BIG PHARMA, ME, YOU—is looking for a longevity hack, a drug or supplement or superfood that will help us live healthier, longer lives. It turns out we already have one. “Exercise is by far the most potent longevity ‘drug,’ ” says Peter Attia, M.D., a surgeon turned physician who focuses on extending health span—stretching the portion of life when you’re able to do what you want to do versus being frail and weak. “The data are unambiguous: Exercise not only delays actual death but also prevents both cognitive and physical decline better than any other intervention. It is the single most potent tool we have in the health-span-enhancing toolkit—and that includes nutrition, sleep, and meds.”

Outlive: The Science and Art of Longevity

Outlive: The Science and Art of Longevity

Now 10% Off

Dr. Attia presents his approach in a new 496-page book called Outlive: The Science & Art of Longevity. The 50-year-old is a former boxer, long-distance swimmer, and endurance cyclist; ate keto before it was a thing; and followed Formula 1 in the 1990s. Now he’s all about rucking, archery, rowing, and strength training—and he’s still into cycling and F1. The Austin-based doctor practices what he calls medicine 3.0, aggressively treating the causes of diseases early and emphasizing prevention rather than waiting for symptoms to manifest. In Outlive, he goes deep on the four primary causes of slow death: heart disease/stroke, metabolic dysfunction, neurodegenerative disease, and cancer. But he goes deepest on exercise, specifically what strength and fitness levels are associated with longer, happier lives. Spoiler alert: He recommends way more exercise than the government guidelines, ideally ten to 12 hours a week. We adapted the fitness chapters in Outlive and interviewed Dr. Attia to give you a concise version of his exercise prescription.

Forge True Functional Fitness

Peak aerobic cardiorespiratory fitness, measured in terms of your VO2 max (the maximum amount of oxygen your body can utilize during intense exercise), is perhaps the most powerful marker for longevity, says Dr. Attia. A 2018 study in JAMA that followed more than 120,000 people found that higher VO2 max was associated with significantly lower mortality. The study also determined that someone of below-average VO2 max for their age and sex (that is, between the 25th and 50th percentiles) is at double the risk of all-cause mortality compared with someone in the top quartile.

dr peter attia working out

Peter Attia, M.D., working out at his home gym in Austin.

Dr. Attia says your VO2 max is a good proxy measure of physical capability: It indicates what you can—and cannot—do. Studies suggest that VO2 max will decline by roughly 10 percent per decade after your 20s and up to 15 percent per decade after age 50. Increasing your VO2 max makes you functionally younger. So having average or even above-average VO2 max has long-term ramifications. Dr. Attia’s goal for his patients is to be at an excellent level for the decade (or two) below their age. Many smartwatches can estimate VO2

2 min read

The Fitbit Sense 2 is the top offering from established fitness tracker brand Fitbit, now owned by Google. 


Software: Fitbit OS
Compatibility: iOS and Android
Battery life: 6+ days
Memory size: 4GB
Display type and screen size: 1.58 inch OLED
GPS: Yes
Water resistance: Up to 50 meters
Heart rate tracker: Yes
Sleep tracker: Yes
Music: No 

It’s a solid watch for those who want everyday exercise tracking and don’t mind missing the sort of smart apps on offer in an Apple Watch. 

Fitbit has cut back some of its watches’ smarts over the years, making the Sense 2 seem a bit shallow by some metrics, and not that interesting from a tech perspective. However, it’s still ones of the best fitness trackers for many, especially as it is often available for significantly less than its original price online.  We also rate it as one of the best Fitbits from the brand.

Price and release date

The Fitbit Sense 2 was released in September 2022. It’s a refresh of the original Sense, which came out two years earlier in 2020. 

This watch sits at the top end of the Fitbit lineup. However, a Fitbit Sense 2 is still a lot more affordable than premium wearables from Apple or Garmin. 

The smartwatch costs $299/£269, but it can often be found at significantly less than that original price. We’d recommend hunting down a deal that saves you at least $50/£50 if you do choose to buy a Sense 2. 

Design and display

Fitbit Sense 2 being tested by Live Science contributor Andrew Williams

(Image credit: Andrew Williams)

The Fitbit Sense 2 looks similar to the original Sense. Maybe that’s for the best, because it’s distinct from all of its rivals, however, it may be a disappointment to original Sense owners who were hoping for something new.

It’s much squarer than a Pixel Watch and more rounded than an Apple Watch. Fitbit was clearly out to make a square shape look friendly with this design — and it really works. The top part is curved glass, the sides are aluminum and the underside is mostly plastic. When the Sense 2 catches the light you can see a sort-of metallic border around the screen. This enables the watch’s ECG feature and is what separates a Sense 2 from the cheaper Versa 4.

The Fitbit Sense 2 also gains a physical button on the side, whereas the original had a touch sensitive area. While the latter may sound more techy, a classic button is much less frustrating to use. 

There’s nothing new in the Sense 2’s watch’s screen tech, but it can be put into an “always on” mode that keeps it lit all day, rather than just timing out after a few seconds. This halves the battery life, but makes it a much better watch. 


Fitbit Sense 2 being tested by Live Science contributor Andrew Williams

(Image credit: Andrew Williams)

The Fitbit Sense 2 has advanced in some areas, but it’s been cut back in others with surprising aggression. 

The result

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