In , David Foster Wallace describes the lopsidedness of competitive teen tennis players, the forearm of their stronger sides having grown out of proportion relative to the rest of their bodies. I remembered that passage as I looked at the Polar M600 dragging my left side ever closer to the earth, wondering whether I, too, would wind up with one enlarged arm after reviewing it. The $329.95 M600 fitness tracker is a hulking beast, and I say that as someone who's hardly a petite little thing. It measures heart rate during activity, and it's sturdy, made with high-quality materials, and well designed—if you're six-foot-three. Because it's also an Android Wear smartwatch, it can do some neat things that other trackers and running watches can't, which makes it an intriguing option for anyone who can deal with its size and shortcomings. Design, Display, and Battery Life The emphasis on high-quality materials, such as Gorilla Glass and a soft silicone band, is immediately apparent with t...

Polar's latest and most impressive device to date is a three-in-one runner's watch, fitness tracker, and smartwatch. It has an optical heart rate monitor and is fully waterproof, but cramming in all that functionality means big hits on battery life and wearability.

High-quality build; Built-in optical heart rate monitor; Runs modified version of Android Wear; Waterproof; Works with both Android and iOS devices

Bulky; Short battery life; Occasionally high heart rate readings in testing; Can't set a custom activity goal

Overall, the Polar M600 looks and behaves more like a smartwatch and less like a running watch. The integration with Android Wear is slick, and Polar Flow is a clean and easy-to-use app, but the watch falls short of expectations once you start running.

Smartwatch notifications; Accurate GPS; heart rate monitor; Easy-to-use Polar Flow app

Bulky; Disappointing activity features; Short battery life

Whether you're working off last night's takeaway, trying to outrun middle age on a treadmill, or lifting weights in front of a mirror like a preening peacock, you're basically just a sweaty mess.

As a comprehensive fitness tracker, the M600 is pretty well equipped. You’re still not guaranteed to find GPS and heart rate tracking in other Android Wear watches, so if you can put up with the mundane looks, it has a slight edge for recording your exercise routines. With an ever-increasing app library, too, there should be something here for pretty much every activity or sport. Android Wear notifications and second screen smartphone controls are handy to have, but only if you’re going to be wearing your watch all the time. I’m not sure this fits the bill for something you’d wear every day, though. The design and build make me think this just isn’t meant to be worn outside of the gym. Seeing as it’s kind of pricey, too, I think you’re either better off with a dedicated fitness tracker like a Garmin Vivoactive HR, or saving a bit more cash and going for an Android Wear watch you’ll actually put on every day. Buy the Polar M600 here from Amazon

GPS and heart rate tracking; Respectable battery life; Built to take a dunking;

Really not very good looking; Limited software smarts out of the box;

GPS and heart rate tracking; Respectable battery life; Built to take a dunking;

Really not very good looking; Limited software smarts out of the box;

Though the watch seems to be working for now, I am a bit wary of it. Upon opening the outer shipping box I found the inner box ripped on all sides of the clear plastic cover, that displays the watch in the store, where it had been ripped off of the box and the watch seemingly having been removed and...

My husband that absolutely refuses to go Apple loves this thing! It's also really big I can't imagine a woman wearing it. The profile is very large. My husband can't wear it to sleep in like he did his fit bit.

Great little android wear. Pros and cons (in my opinion): Pros - Nice, clear and vibrant display. - Works with swimming. - Unit is removable from strap, and it can be changed out and cleaned properly. - Polar has a great app that syncs with other things like Strave, useful.

Excellent device. The band is soft and comfortable for all day use. Using with iOS. Short battery life requires nightly charging. Ok once you get in the habit. Features are excellent and the HR monitor works much better than other wrist base devices for tracking sport performance.

There's no shortage of Android Wear watches to choose from. Companies including Huawei, LG, Casio, and Fossil all have smartwatches that run on Google's wearable operating system, and all of them can use Google Fit's activity tracking.

Bold; bright touchscreen display; Onboard GPS and space for local music; Rated IPX8 so you can swim with it; Android Wear will add useful features and notifications for those connected to an Android smartphone

Bulky design makes it hard to wear all day; Heart rate monitor can be slow to catch up to high pulse rates; Expensive for what it offers; Not worth the money for iPhone users when they can get the comparable Apple Watch Series 2 instead