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Hands On: Amazfit T-Rex 3 Smartwatch Delivers AI Strength Training Guidance

On display at IFA, the Amazfit T-Rex 3 smartwatch can help you train for marathons and even guide your strength training. At $299, with a rugged build and long battery life, it looks promising.

 & Andrew Gebhart Senior Writer, Smart Home and Wearables

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(Credit: Andrew Gebhart)

BERLIN—The big brand smartwatches released this fall have each touted AI guidance to help you customize training based on your recovery status and energy levels. The $299 Amazfit T-Rex 3 debuting at IFA follows that trend and promises in-depth AI coaching for strength training.

The T-Rex 3's built-in Zepp assistant offers full voice control over your watch’s functions. It’s also the source of whatever training guidance you need. You can absolutely get customized advice to build toward an upcoming marathon or a 5K, a common feature among fitness wearables. You can also tell it you want to work on your biceps or your quads.

I tried the Amazfit T-Rex 3 here at IFA, and the big, 1.5-inch AMOLED screen looked bright in the controlled indoor environment. With up to 2,000 nits of brightness, it should be visible even in direct sunlight. It's a sizeable watch, but it didn’t feel bulky, though it's more in line with other GPS sports watches like the Samsung Galaxy Watch Ultra ($649.99) or the Apple Watch Ultra 2 ($799) than a petite option like the Garmin Lily 2 ($249.99).

(Credit: Andrew Gebhart)

The T-Rex 3 is also durable, with a military-grade rating and the ability to withstand 10ATM of water pressure (depths of up to 328 feet in calm water). It’s certified for freediving down to 147 feet and can track 170 different activities in and out of the water. To that end, it has dual-band GPS to precisely track your location when you're training outdoors.

With a large 700mAh battery, the T-Rex 3 promises over three weeks of power on a charge under ideal circumstances and an impressive 13 days with heavy use. That’s well beyond the one- to two-day capacity of smartwatches from Apple, Google, and Samsung. It even outpaces the impressive 11-day battery life of the Garmin Vivoactive 5 ($299.99).

The T-Rex 3 is compatible with Android and iOS, making it impressively well-rounded. At $200, it's priced the same as the Samsung Galaxy Watch 7 and much less than rugged sports watches like the big-name Ultras or the Garmin Fenix 8 ($1,199.99). We’ll test it soon to find out whether the built-in AI assistant can help this affordable smartwatch keep up with its expensive competition.

The Amazfit T-Rex 3 was announced alongside the company’s new Helio Ring, which will offer a relatively ordinary variety of sleep- and fitness-tracking features.

About Our Expert

Andrew Gebhart

Andrew Gebhart

Senior Writer, Smart Home and Wearables

My Experience

I’m PCMag’s senior writer covering smart home and wearable devices. I’ve been reporting on tech professionally for nearly a decade and have been obsessing about it for much longer than that. Prior to joining PCMag, I made educational videos for an electronics store called Abt Electronics in Illinois, and before that, I spent eight years covering the smart home market for CNET. 

I foster many flavors of nerdom in my personal life. I’m an avid board gamer and video gamer. I love fantasy football, which I view as a combination of role-playing games and sports. Plus, I can talk to you about craft beer for hours and am on a personal quest to have a flight of beer at each microbrewery in my home city of Chicago.

The Technology I Use

I tend to like mixing flavors from various companies. My personal computer is an Apple MacBook Pro. My phone is a Google Pixel 7a. On my wrists are an ever-rotating lineup of the latest smartwatches, and I sometimes wear two at once for testing and extra style. The Apple Watch Ultra 2 is a mainstay on my wrist because I use it as a control for evaluating the accuracy of other devices' fitness metrics. 

I spend plenty of time in front of my entertainment center, which features a 55-inch LG OLED TV, a Yamaha soundbar, a Nintendo Switch, and a PS5. (I insisted on getting the PS5 with the disc slot when they were hard to come by and haven’t used the feature in more than a year.) I thought I’d have given in to temptation and snagged an Xbox to play Starfield by now, but Baldur’s Gate 3 saved me money by distracting me long enough for the Starfield hype to blow past.

I have two cats and sneeze plenty, so I have a Shark Air Purifier to help me fight back against their dastardly, shedding ways.

I use my aforementioned Pixel 7a and a Nest Hub for Google Assistant, an iPhone 16e and AirPods to talk to Siri, and an Amazon Echo Show 5 and Echo Show 15 for Alexa, so I’m not in danger of losing touch with any of the big three digital assistants.

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