I tested 7 fitness trackers for running at the NYC Marathon

Table of Contents

I ran the New York City Marathon wearing seven fitness trackers to see how they compare, and I left with a few favorites. I received a lot of strange looks, but if shame is the price to pay for finding the best fitness tracker for running a marathon, so be it.

While training for the race, I used 10 different trackers in total — deep breath — the new Apple Watch Ultra 3 (which replaced my Apple Watch Ultra 2, which replaced my Apple Watch SE), the Garmin Forerunner 570, the Whoop MG, the Pixel Watch 4 (as well as the older Pixel Watch 3), the Suunto Run, the Oura Ring 4, and the Fitbit Charge 6.

In the end, I ran the marathon using the seven most updated models of our top contenders. I was most impressed by the Whoop MG, Garmin Forerunner 570, and the Apple Watch Ultra 3. The more affordable Suunto Run also has a lot to offer runners.

I also wanted to find the most reliable fitness trackers for marathon training, so during each week of my training, I focused specifically on one tracker or smartwatch. To ensure the best data collection possible, I also wore it during the day and night outside of my workouts to test its battery life and recovery data collection.

While I focused on a different tracker each week, I wore all seven models during all of my workouts during the entire 18-week training season. In total, I ran 508 miles, had 30 weightlifting sessions, rode a bike for 110 miles, and practiced yoga or Pilates about once a week. And I did all of that looking like Bucky Barnes.

Reader: It was humiliating, and I did it all for you.

I wanted a wearable that had a comfortable design, easy-to-understand workout metrics, useful recovery metrics, a long battery life, and was worth the price. I wanted it to help me train, recover, and run the marathon. So, here’s everything I learned during my 508-mile quest to find the best fitness trackers for running a marathon.

Best health tracker for marathon training

My pick: Whoop MG 4.0

I wore the Whoop MG for 18 weeks and 500 miles of training.
Credit: Joe Maldonado / Mashable

The new Whoop MG is an incredibly comfortable, minimalist tracker designed for health and recovery rather than in-the-moment performance, and I really liked it. 

Its soft, lightweight band feels almost invisible, and because there’s no screen, you’re blissfully free from constant notifications or distractions — something I didn’t realize I needed until I had it. 

That said, the lack of display, GPS, and heart rate feedback during workouts makes it essentially useless for live training metrics, such as pace or distance. So, like with many health trackers, you’ll likely need to also use a secondary fitness tracker to get real-time data on your run, including pace, heart rate, and elevation.

Still, the post-workout insights are impressive: you can literally see spikes in strain or stress — even pinpointing moments like a fall or tough interval — making it feel personal and validating. 

The recovery metrics are where Whoop truly dominates. Its journal feature is flexible, allowing you to log habits like alcohol use, weed, or even eating beans, all of which are correlated with sleep, stress, and recovery. The sleep tracking is top-tier, breaking down stages, disturbances, and recovery readiness into clear, actionable data that helps you decide when to push or rest. The battery system is genius — a slide-on charger means you never have to take it off, not even in the shower. 

While the subscription model is financially frustrating, Whoop’s depth of recovery data makes it arguably the best tool for understanding your body.

Also tested: Oura Ring 4

Credit: Joe Maldonado / Mashable

The Oura Ring is probably the best-looking wearable I tried during training season. It’s sleek, comfortable, and surprisingly unobtrusive, and it excels at recovery tracking. Obviously, much like the Whoop MG, this shouldn’t be the only wearable you use for marathon training — there’s no workout data, because there’s no screen, and it has no ability to provide live training feedback like pace or heart rate. It provides almost no useful data during or immediately after workouts, making it more of a wellness tracker than a performance tool.

It never pinched or became uncomfortable — though I wouldn’t recommend wearing any rings at all while lifting weights. When it comes to workout metrics, the Oura Ring simply isn’t built for live training feedback. 

However, where it truly shines is in recovery tracking. It monitors key health indicators such as heart rate, heart rate variability, body temperature, sleep quality, and general activity, delivering consistently insightful data that helps you understand your readiness and recovery trends. 

It’s also surprisingly useful for cycle tracking (if you’re into that sort of thing), offering accurate temperature-based insights. The Oura Ring 4 battery life is excellent — it can easily last several days, and I simply charge it while showering without ever running into low power issues. 

Though it’s pricey and requires a subscription, it’s HSA/FSA eligible, which helps. Overall, the Oura Ring is an exceptional sleep and recovery tracker, best paired with a dedicated fitness device for training.

Read Mashable’s full review of the Oura Ring 4.

Best lifestyle smartwatches for marathon training

My pick: Apple Watch Ultra 3

The Ultra 3 easily beat other smartwatches, but it’s also pricey.
Credit: Joe Maldonado / Mashable

The Apple Watch Ultra 3 is one of the most advanced smartwatches yet — powerful, durable, and thoughtfully designed, though not without its quirks. 

Its massive screen and hefty build make it feel substantial on the wrist, but despite its size, it remains surprisingly comfortable, even for sleeping. It’s not the lightest watch out there, but it’s well-balanced enough for all-day wear. 

During workouts, the metrics are simple but reliable, giving you accurate readings of heart rate, pace, and time, with the option to plan structured workouts directly on the watch. You can pause your run by clicking any two buttons at once, and start a new segment by clicking the orange button. I appreciate how easily I can switch between media, segments, and workouts.

Post-run data is basic compared to dedicated running watches, but still plenty for casual runners. The recovery and health tracking features are robust — it tracks sleep, cycle phases, blood oxygen, respiration, and cardio fitness, and you can manually add data on nutrition, medication, or symptoms for a more holistic picture. 

Battery life is the best of any Apple Watch, lasting through a full marathon without dying and recharging quickly. For instance, I wore it all day and all night, during workouts and travel, but just charged it while I showered, and had no problem with the battery life. 

At $799, it’s by far the priciest watch I tested, but its massive screen proved unexpectedly useful during my marathon — I could easily read notes and spot friends on the course, and even reply to texts mid-race without missing a step. For runners who aren’t training for a marathon, the new Apple Watch Series 11 also impressed our Apple expert.

Also tested: Google Pixel Watch 4

If you’re looking for an Android smartwatch for running, Mashable has been very impressed with the Pixel Watch 4.
Credit: Joe Maldonado / Mashable

I really enjoyed using the Pixel Watch 4 for my training, but it had one huge flaw that moved it below the Apple Watch Ultra 3 for marathon training: it died during the marathon. I never had an issue during marathon training, including a long run that was 22 miles long. So, it’s still one of the best smartwatches for running in general. But during the race itself — which includes leaving my apartment about five hours before actually starting the race, sitting in a relatively cold start village, and running the race — my Pixel Watch 4’s battery died. My Apple Watch SE also died during the 2023 New York City Marathon, so I’m not unfamiliar with the pain, but it’s not what you want. 

However, during training, I was pleased with the watch. It’s a solid, well-rounded smartwatch that balances comfort, performance, and smart integration. It’s lightweight and easy to wear around the clock — comfortable enough to sleep in, with no irritation or bulk. During runs, it delivers all the essential workout metrics like pace, heart rate, and time, displayed on a bright, easy-to-read screen that holds up even in direct sunlight. 

The buttons feel a bit mushy, but their presence is still appreciated for sweaty workouts when touchscreens fall short. Post-run, the Fitbit app provides deeper insights such as stride length, step cadence, ground contact time, vertical ratio, and oscillation. 

While Fitbit isn’t my favorite tracking platform, its integration here is smooth and responsive, especially with the option to create custom workouts, from interval sessions to threshold runs, and even receive AI-powered daily run recommendations. 

Recovery tracking is solid, too, with accurate sleep scoring that aligns closely with health trackers like the Oura Ring and Whoop. 

The battery life (say it with me: boooooo) is supposed to last around 48 hours for regular use, which isn’t stellar for hardcore fitness users but is fine for a lifestyle watch, and charging is faster and more reliable than previous Pixel Watches.

At $350, it’s a fair value — particularly if you already own a Pixel phone.

Read my full review of the Google Pixel Watch 4.

Best fitness tracker for running and marathon training

My pick: Garmin Forerunner 570

Credit: Joe Maldonado / Mashable

I’m not saying anything revolutionary or shocking when I say Garmin is a runner’s watch.

The Garmin Forerunner 570 is one of the most advanced fitness watches on the market, and it’s obvious from the second you wear it for a run. The workout metrics are nothing short of incredible. During workouts, it covers all the essentials — pace, heart rate, time — and presents them clearly on a bright, easy-to-read display. I don’t love the buttons (they’re a bit mushy for my taste), but they’re responsive enough.

Post-run data is where Garmin really shines: run/walk detection, training effect, power output, and running dynamics like vertical oscillation and stride length offer a level of insight few devices can match. It even provides adaptive training plans based on your data. 

On the recovery side, Garmin’s training readiness and body battery features combine sleep, stress, and HRV for actionable insights that rival Oura and Whoop.

Of course, it isn’t without its drawbacks — starting with comfort. I struggled with how it felt on my wrist; during a rainy run in the middle of my training block, the band dug into my skin and rubbed it raw, leaving it sore enough that I couldn’t wear it for the rest of the day. Other people have complained that they’ve gotten rashes from the Garmin, too. You can get new straps that might solve the issue, but boy was it unpleasant.

The battery life is excellent, lasting up to 11 days, and while the $550 price tag is steep, it’s easy to see why athletes swear by it.

More affordable running watch: Suunto Run

Credit: Joe Maldonado / Mashable

The Suunto Run also has so, so, so much data. What makes it slightly lower on the list than the Garmin Forerunner 570 is that it has fewer smartwatch perks than the Garmin does — it doesn’t have the third-party app support, music, and contactless payments available on the Garmin and, in general, it feels kind of cheap — especially the charger.

But I did really like the Suunto Run. It delivers an impressively balanced experience for runners who want reliable data, comfort, and battery life without overcomplication. Its Velcro strap is lightweight, breathable, and secure — it doesn’t rub, slip, or shift during workouts, and it’s comfortable enough to sleep in, which makes wearing it around the clock surprisingly easy. 

During runs, the watch focuses on the essentials: pace, heart rate, and cadence, all displayed clearly on a bright, easy-to-read screen. The physical buttons feel responsive and satisfying to press, a big plus when you’re sweaty mid-run. 

After workouts, the Suunto app unlocks a deeper layer of training metrics, including training load, stress score, and normalized graded pace. While not every stat will matter to a casual marathoner, the breadth of data is impressive and well-organized. 

On the recovery side, Suunto nails clarity: it combines heart rate variability, sleep quality, and training balance into a single, easy-to-read recovery score that aligns closely with results from Oura and Whoop, though HRV readings can vary slightly. 

The battery life is excellent, lasting up to 12 days in smartwatch mode or 20 hours in performance mode, so you’ll rarely think about charging. At $249, the Suunto Run is a smart, well-priced choice for dedicated runners who don’t want all the fuss of a smart watch but do want all the data of a running watch.

Also tested: Fitbit Charge 6

Good for counting steps, but not much more.
Credit: Joe Maldonado / Mashable

The Fitbit Charge 6 is the least expensive option I wore, and it shows. It’s lightweight, but don’t let that fool you — it’s a relatively uncomfortable tracker in comparison to the other trackers I tested. In fact, after two nights of sleeping with it on, my wrist was bruised. 

During workouts, it struggles to keep pace with more advanced fitness watches. The GPS accuracy is inconsistent, overestimating distance on one run and underestimating on the next, which throws off pace data — a dealbreaker for serious runners. It also doesn’t track elevation gain, which is an important part of training for a particularly hilly race like the New York City Marathon. 

Mid-run readability isn’t ideal, and the connection with my phone dropped more than once, but heart rate tracking shines — responsive, accurate, and enhanced by helpful haptic alerts when you shift zones. 

Recovery tracking is surprisingly strong, offering clear sleep scores and resting heart rate data that feel well-calibrated for general wellness, even if not the most detailed. The real standout, though, is battery life, which easily lasted a full week with heavy use — truly impressive for a device at this size and price point. 

At $159, the Charge 6 delivers solid value for everyday athletes who want the very least. If you’re looking for the best fitness tracker for running for beginners, this is a budget pick worth considering. For marathon training, it can’t keep up. It’s effectively a fancy pedometer, and you might be better off buying one of those.

After 500 miles, what would I recommend to a friend?

So, after 18 weeks of training, 500 miles, and so, so many funny looks (that’s what happens when you wear seven fitness trackers at the same time), what did I decide?

Here’s what I’d recommend to a friend training for a marathon: I’d wear the Whoop MG for health tracking, particularly during training and recovery. I’d wear the Suunto Run during training, unless I had a lot of money to play with, and then I’d get a Garmin Forerunner 570. If I was specifically running the NYC Marathon and was worried about finding people, I’d keep the Apple Watch Ultra 3 on my wrist for the marathon. 

For now, I think I might go without any device for a few weeks. Free me from the data.