I’ll be back on track on Monday, though, and I might grab one of these deeply discounted Garmin fitness watches to track my progress. Garmin Forerunner® 255, GPS Running SmartwatchGarmin Forerunner® 255, GPS Running Smartwatch $199 (was $349) The battery lasts up to 14 days on a charge. Garmin Instinct 2, Rugged Outdoor Watch with GPS $169 (was $299) The battery lasts up to 28 days on a charge without GPS. With the GPS turned off, the battery will last a massive 28 days between charges thanks to the black-and-white screen. More Garmin fitness tracker and running watch deals