The Spark 3 is a good fitness tracker for triathletes. It also features a unique and very simple-to-use tracking system. If you're prepared to pay extra, you can get a model with a heart rate monitor and music playback.
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Pros
Pro The mapping features work great and are easy to use
You'll never have to worry about getting lost with a Spark 3 on your wrist. First of all, you can create a new interesting route in the app from the comfort of your home and then simply follow it with your watch during the run. Or you can record your whole route as you run or hike and then trace back your steps in case you get lost.
Pro It's a good fit for amateur/casual athletes
This watch keeps track of your pace, calories, and heartbeat without overwhelming you with highly specialized fitness metrics that usually don't add any value for a beginner anyway.
Pro You can get a specialized watch with extra funcitonality
The Spark 3 comes in several flavors: the basic Spark 3; Spark 3 Cardio with a built-in heart rate monitor and Spark 3 Music that can store music and connect Bluetooth headphones. There's also a combination of Cardio + Music.
Pro You can use it for triathlon training
This watch will work for tracking running, biking, and swimming, which makes it a good option for triathletes.
Cons
Con The battery life is disappointing
The Spark 3 will last only about 4 days with GPS off, when you can find watches that hold charge for 5-7 days and more.
Con TomTom products may become increasingly hard to find
There has been information that TomTom is decreasing its involvement in producing wearable tech, so their sports watches may become hard to find in stores.
Con There's some trouble linking it up with headphones
Sometimes it takes a couple of tries before you can get your headphones working with the watch.
Con The controls are a little confusing
All modes and functions in the menu are represented with icons that can be hard to decipher for a new user.