Most smartwatches have a fitness component for the very good reason that a watch is moving with you throughout the day. For counting steps, encouraging activity, and tracking occasional long walks, runs, or bike rides, most smartwatches will do fine. If you want a device to track your everyday runs or cycling sessions, you want a GPS running watch. If you’re serious about tracking and improving your movement and sleep, a fitness tracker will do that for less money and look more discrete doing so (and if you have health insurance, you may get a discount or incentives to use one). There are smartwatches that lean heavily toward sports and fitness in their marketing, but there are drawbacks to each of them not found in a dedicated device. At the other extreme, if you all you really need is step counting, a hybrid smartwatch—with an analog face like a traditional watch, but with built-in motion sensors and months-long battery life—may be a better option.
"Sport watch" functionality often includes activity tracker features (also known as "fitness tracker") as seen in GPS watches made for training, diving, and outdoor sports. Functions may include training programs (such as intervals), lap times, speed display, GPS tracking unit, Route tracking, dive computer, heart rate monitor compatibility, Cadence sensor compatibility, and compatibility with sport transitions (as in triathlons). Other watches can cooperate with an app in a smartphone to carry out their functions. They are paired usually by Bluetooth with a smartphone. Some of these only work with a phone that runs the same mobile operating system; others use a unique watch OS, or otherwise are able to work with most smartphones. Paired, the watch may function as a remote to the phone. This allows the watch to display data such as calls, SMS messages, emails, calendar invites, and any data that may be made available by relevant phone apps. Some fitness tracker watches give users reports on the number of kilometers they walked, hours they slept, and so on.
The Huawei Watch 2 comes into its own if you’re looking for a smartwatch that can double as a sports watch, thanks to built-in GPS and a heart rate monitor on its rear. Use the 4GB of built-in storage to save your Google Play Music playlists offline and you can pair Bluetooth headphones for a phone-free experience. The Huawei Watch 2 will work with Huawei’s own suite of fitness apps, Google Fit, or other third-party apps such as Strava, offering excellent choice.
Fitbit Versa: The Fitbit is the health tracker for the masses and they have a model for every need. But the best option for adults who do a moderate amount of exercise and just want to keep tabs on their general fitness (ie: most of us), the Fitbit Versa is a great choice. It's an entry-level smartwatch. For more on the Fitbit Versa’s various attributes, read my in-depth review. ($350)
It's also very bulky. Sitting at 46mm wide might not sound like much, but then you have the depth, and there's a lot of it here. In fact, if we had to pick one criticism of the Watch Sport it's that it crams so much in, it does so to its detriment. The size will be too overbearing for many, but the pay-off in size means that most of the great features of the Watch Sport have been discarded.
Why we like it: Compared with a smartwatch or fitness tracker, a dedicated GPS running watch is focused on one category of exercise: outdoor movement. GPS watches offer the fastest GPS signal lock-on and more-precise maps, while also showing up to the second details on your pace, heart rate, mile split times, and a host of other stats on an always-on display. The physical buttons on a GPS watch are easier to use while moving (and without looking), rather than having to swipe or tap on a tiny glass screen. A GPS watch’s longer battery life can better handle endurance events than a smartwatch. And the software and apps behind a good GPS watch provide more statistics and training programs to improve your efficiency. While GPS watches can show notifications, the weather, and a few other smartwatch-like conveniences, they’re much more limited in what can be done from a wrist than a smartwatch—or even a fitness tracker like the Vívosmart.
Receive Texts, Emails, And Alerts Without Reaching For Your Phone/ Military-Grade Gear S3 Is Tough Enough To Handle The Elements/ Built-In S Health App, Track Your Steps, Monitor Your Heart Rate, And More/ 4GB Internal Memory/ RAM 768MB/ Wi-Fi/ Bluetooth 4.2/ Gorilla Glass SR+ Case Crystal/ 1GHz, Dual Core (Exynos7270) Processor/ 360x360 Display Resolution/ On-Cell Touch AMOLED Touchscreen/ GPS Navigation/ Dark Grey Finish
Samsung released its Galaxy Watch, a follow-up to the Gear S3, a prior pick. The Galaxy Watch is available in 42 mm and 46 mm configurations, with either a Bluetooth-only connection or Bluetooth plus LTE from T-Mobile (at launch). The biggest update seems to be the battery life, which the company claims will last for days between charges. The Bluetooth version of the Galaxy Watch is available for $330 for the smaller version and $350 for the larger (46 mm) model; the 42 mm LTE version is available for $380 and the 46 mm is $400.
The top smartwatches that debuted at the 2017 Consumer Electronics Show included the Casio WSD-F20, Misfit Wearables Vapor and the Garmin Fenix 5 series. Apple released on September 22, 2017 their Apple Watch Series 3 model which offers built in LTE cellular connectivity allowing phone calls, messaging and data without relying on a nearby smartphone connection. 
The company claims that the SpO2 monitor will help its devices look for signs of sleep apnea and other breathing problems, potentially great features for devices that are meant to be worn 24/7. It'll be used primarily in Fitbit's forthcoming Sleep Score Beta, which further analyzes sleep quality using heart rate and breathing data. Starting sometime this November, users with devices that only have heart rate monitors can get a "sleep score" after each night's sleep. Those with an Ionic, Versa, or Charge 3 will presumably have better data thanks to the SpO2 monitor collecting breathing data.
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Smart watches are here to change the way you live. Now you can power through your workouts while the latest technology keeps track of your every move, check your calendar and keep an eye on the weather forecast wherever you are. You can also sync your smartphone with your watch, so you can check your texts, see who’s calling and receive notifications while keeping your iPhone 6 Plus safely tucked away.