4. Fitbit Flex Wireless Activity Tracker
Though the Pokémon GO Plus also competes for your precious wrist real estate, a Fitbit is an excellent complement to the first app that truly understands how to reward fitness (by allowing you to hatch eggs).
You’ll be racking up dozens of kilometers hatching eggs, and a fitness tracker is a smart way to keep track of the extra mileage you’re putting in every day. If you use Fitbit’s passive tracking app alongside Pokémon GO, soon you’ll be faster than a Jolteon.