Get that grad a fitness tracker or smartwatch!

The newest Fitbit is the best one: it packs heart rate on a small band, and has plenty of designs as well as styles. Just don't wear it swimming, because it's only splash resistant.

The Fitbit Flex 2, on the other hand, is waterproof. And it can be worn with bands, jewelry accessories or pendants, like this one.

Fitbit is currently our favorite fitness-tracking platform. The Charge 2 adds better controls for timing runs and workouts, but doesn't have GPS.

If you're getting a gift for a runner, Garmin's GPS watch is the pick. It's also waterproof for swimming, and tracks heart rate. Its battery life lasts a couple of weeks, too.

The best smartwatch at the moment, Apple's swim-ready, GPS-equipped Apple Watch Series 2 also has a speakerphone, Apple Pay and works with plenty of strap accessories. But you still need an iPhone to use it.

Spend a little less, and the Series 1 offers just about everything the Series 2 has, minus GPS and swimproofing. It's a great everyday pick.

The flashiest and splashiest smartwatch, Samsung's Gear S3 has optional standalone LTE phone modes in some models, and a design that looks like a real (but big) sports watch. It works with the iPhone as well as Android phones, but runs its own limited apps.

For Android phone owners, the best Android Wear-ready watch running Google's software might be Huawei Watch 2. It also has GPS, Android Pay and always-on heart rate for workout-tracking.