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.

If you've been waiting for Prime Day to upgrade your running watch, I've got good news — the sales have started early. I review running watches for a living, and have done so for the past decade, so I know exactly what I'm looking for when it comes to the tech on my wrist on race day.