Want a solid fitness tracker without dropping $400+ on something new? Buying used can save you a ton of money while still getting you GPS, heart rate tracking, SpO2 sensors, and all those smart features. The catch is knowing which models actually hold up and which ones are just bad deals in disguise. Here’s our breakdown of the ten best used smartwatches for fitness.
A lot of people assume used electronics are somehow broken or inferior. That’s mostly nonsense. Fitness tracking sensors—the heart rate monitor, GPS, blood oxygen sensor—don’t just give up because a device is a year or two old. They’re solid-state hardware that keeps working.
What you’re really getting when you buy used is a former flagship device at a steep discount. An Apple Watch Series 7 that cost $399 new? You can find one in great shape for $150-200. It still tracks your workouts just as well as the day it launched.
There’s also the environmental angle, if that matters to you. Keeping electronics out of the waste stream longer is genuinely good. A lot of fitness people I know care about that kind of thing.
The real work is knowing what to look for and where to buy safely. We’ll get to that.
Here’s what actually matters when shopping the secondary market.
The whole point of a fitness smartwatch is tracking your body. You need accurate heart rate monitoring at minimum—most devices do this okay, but cheaper or older models can get sketchy during hard workouts.
Step up to models with ECG, blood oxygen monitoring (SpO2), and skin temperature tracking for more detailed health data. These became standard around 2020 on flagship devices.
This is the one area where used devices genuinely degrade. A watch that lasted two days fresh out of the box might only get you a day and a half after two years of daily charging. That said, plenty of people report their devices still hit 80-90% capacity even after significant use.
Garmin watches crush it on battery—some models last weeks. Apple and Samsung need charging every day or two.
If you swim or sweat a lot, water resistance matters. Most modern fitness watches handle at least 5ATM, which is fine for swimming. Rugged models go further with actual military durability ratings.
Check the rating before you buy. IP67 and 5ATM are very different things.
This is the most boring but most important factor. Some older watches don’t get updates anymore, which means security problems and apps that stop working. Apple Watch gets about 4-5 years of support. Samsung and Garmin are similar.
Make sure your potential purchase still gets updates and plays nice with your phone.
Prices are typical for devices in good condition.
The Series 7 is still everywhere in the used market, and it’s easy to see why. The bigger display actually makes a difference when you’re trying to read your stats mid-run. The crack-resistant glass holds up better than earlier models too.
Fitness tracking covers everything: GPS, heart rate, blood oxygen, ECG, sleep tracking. The Activity rings are either motivating or annoying depending on your personality—I find them helpful, honestly.
When buying used, check the screen carefully. Scratches are hard to avoid on these, but deep ones affect usability. The always-on display is genuinely useful during workouts.
Expect to pay: $180-250 for the 45mm GPS model.
The Series 8 added temperature sensing for cycle tracking and crash detection. If you’re into the health insights thing, the temperature sensors actually provide useful data. It’s not a huge leap from the Series 7, but the extra features matter for some people.
Used prices haven’t dropped as much as I’d like since it’s relatively recent, but if you find a good deal, it’s the most future-proof option here.
Expect to pay: $250-320 for the 45mm GPS model.
Samsung’s Galaxy Watch 5 has some unique tricks, like the Body Composition analysis that measures body water and skeletal muscle mass. The BioActive sensor handles optical heart rate, electrical heart signals, and bioelectrical impedance analysis in one package.
They dropped the rotating bezel for a touch interface—I know some people hate that, but the design is cleaner. Battery life runs about 40 hours with normal use, though GPS workouts will drain it faster.
Samsung Health is solid for workout tracking, and it works with both Android and iOS, though you’ll get more features with a Samsung phone.
Expect to pay: $150-220 for the 44mm model.
The Watch 4 was the one that switched Samsung to Wear OS, giving you access to the full Google Play Store. The BioActive sensor debuted here, so for most fitness purposes it’s nearly identical to newer models.
The real appeal is the price. You can find excellent condition units under $120 regularly. For a full-featured smartwatch, that’s hard to beat.
The trade-off is battery life—it was never great, and it’s worse now. Plan on charging every day or so.
Expect to pay: $80-150 depending on condition.
Garmin lives for fitness tracking, and the Venu 2 is exactly what you’d expect from them. It’s not trying to be a smartphone replacement—it’s all about workout data and health metrics.
The Venu 2 has muscle maps showing which muscles you worked, automatic rep counting for strength training, and a ton of sport profiles. Battery life hits up to 11 days in smartwatch mode, which is ridiculous compared to Apple and Samsung.
The AMOLED screen looks great but eats battery faster than Garmin’s usual muted displays. Sleep tracking includes sleep scores and hydration tracking.
Expect to pay: $200-280.
For runners specifically, the Forerunner 245 is a pure running watch that’s also good for other fitness stuff. GPS tracking is super accurate, running dynamics are advanced, and training status helps you avoid overtraining.
It skips some smartwatch features—no app support, no music storage unless you get the Music version. But for runners who care about pace, distance, and recovery, that’s not the point.
Battery life is the real selling point: up to seven days in smartwatch mode and 24 hours in GPS mode. This is the watch for marathon training.
Expect to pay: $150-220.
The Fenix 6 is the tank of Garmin’s lineup—built for serious athletes and people who spend time outdoors. It’s bulky, but it’s basically indestructible and packed with features.
TOPO maps for trails, ClimbPro for climbing and cycling, expedition mode for multi-day trips. The battery can last weeks in certain modes.
In the used market, this is a steal. Prices have come way down from the original cost, so you can get a serious adventure watch without paying adventure-watch prices.
Expect to pay: $250-400 depending on the variant.
Fitbit’s Sense line is all about stress management and holistic health. The Sense 2 has cEDA sensors for stress detection, plus ECG, SpO2, and skin temperature tracking.
The health insights dashboard pulls data from everything and tries to give you the big picture. It’s lighter and more comfortable than a lot of competitors, which matters when you’re wearing it 24/7.
Battery life hits about six days, which is solid. The app ecosystem is more limited than Apple or Samsung, but Fitbit’s own health features are legitimately good.
Expect to pay: $150-220.
The Charge 5 is that weird middle ground between fitness band and full smartwatch—premium health sensors in a smaller package. It has ECG, SpO2, and stress tracking, which used to only be on flagship watches.
For fitness specifically, it’s great. Auto-tracking for workouts, GPS via your phone, detailed sleep analysis. The small size makes it comfortable for wearing all the time.
The downside is the tiny screen and no real apps. You’re stuck with Fitbit’s ecosystem, which is fine but not as flexible as the competition.
Expect to pay: $80-130.
Google’s first attempt at their own smartwatch mixes Fitbit health tracking with Wear OS. It’s pretty, the design is premium, but the battery life sucks—maybe 24 hours with normal use.
Fitness features include continuous heart rate, SpO2, sleep tracking through Fitbit, and auto workout detection. GPS is built-in, so you can leave your phone behind for runs.
The used market is still figuring out pricing, but it’s settled into a reasonable range. Software support is three years minimum, which is decent.
Expect to pay: $180-250.
Here’s where to look and what to watch for.
Amazon Renewed has you covered with warranties—worth paying extra for the peace of mind. eBay can work if you stick to sellers with good ratings and clear return policies. Swappa is specifically for used electronics and actually verifies listings.
Local options like Facebook Marketplace can be good deals, but you lose buyer protection.
Ask for battery health if you can. On Apple Watch it’s in Settings. For other devices, ask how often they’re charging.
Look carefully at screen photos for scratches. Check the band and case too. Ask about any water exposure—submersion can cause problems even if the device is rated for water.
Get the serial number and verify it’s not stolen. You can also check warranty status that way.
Sellers who won’t send more photos, prices way below market value, vague listings with no details. If something seems too good to be true, it probably is. Skip platforms with no buyer protection unless you can meet in person and test the device.
The best used smartwatch for fitness depends on what you need and what phone you use. Apple ecosystem? Series 7 or 8 are the move. Android? Galaxy Watch 5, Watch 4, or Pixel Watch are all solid.
If you want pure fitness focus and don’t care about smartphone features, Garmin wins—Forerunner 245 for runners, Fenix 6 for adventurers. Fitbit works if you want good health tracking at lower prices.
Buying used gets you premium features without the premium price. Just verify condition, check that updates are still coming, and buy from somewhere with buyer protection. You can absolutely find a great fitness watch without spending a fortune.
Yes. Fitness sensors don’t degrade much with age, and you get flagship-level tracking at a fraction of the cost.
Two to four more years with normal use. Battery capacity drops over time, but most devices stay functional. Check the original release date and how much longer it will get updates.
Water resistance rating (5ATM or higher), any history of water exposure, and signs of damage. Even rated devices can develop issues after getting submerged repeatedly.
Yes, as long as it was properly unpaired from the previous owner’s iCloud. Set it up like new and it’ll pair normally.
Most optical sensors from 2019 onward stay accurate for years. They might drift a little, but you’re still getting clinically useful data for fitness.
Fitbit has better sleep tracking and stress monitoring in a smaller package. Garmin has more advanced workout metrics and better battery life. Pick based on what matters more to you.
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