For Prime Day Amazon is offering a whopping 43% discount on the Forerunner 255, bringing its price down to just $199 from its regular price of $349. This is the company’s best-selling product, and it has a 4.7 out of 5 rating and it can be purchased as a limited time offer that does not require a Prime membership.

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.