The summer is a fantastic time to get outside and be active, and if you're planning on getting serious about fitness this season, you might want to add a good fitness tracker to your repertoire to keep yourself in sync with your goals.

GPS accuracy is second to none, with the pre-measured 5km test showing that the Instinct 2 was accurate to within a handful of meters. That's impressive. Put simply, this is a trustworthy watch you can rely on.

Prices have already begun to drop on Garmin fitness watches for Amazon’s Prime Day sale (which officially begins tomorrow, July 8). One of the best deals so far is Garmin’s Forerunner 955, an older model with advanced functionality that keeps it relevant even though the company has released flashier models.