Garmin Forerunner fitness watches get huge refresh: All 5 detailed

Of all the watches Garmin introduced today, the Forerunner 45 and 45S seem like the ones most aimed at mainstream audiences. They're the least expensive of the bunch, and like many fitness trackers, they're designed to be worn 24/7 so they can monitor sleep, steps, distance, and calories burned. They both also offer an energy monitoring feature called Body Battery, which allows users to "focus on their wellness and better plan their day to optimize times for activity and rest."

There don't seem to be many differences between the Forerunner 45 and 45S – they both have built-in GPS, heart rate monitoring, and a battery life that can stretch as long as 7 days when used in smartwatch mode (13 hours in GPS mode). The only difference, then, seems to be size. The standard Forerunner 45 uses a 42-millimeter case, while the 45S uses a 39-millimeter case for users with smaller wrists.

Then we come to the final watch of the bunch: the Forerunner 945. This is certainly the most capable watch Garmin introduced today, as the 945 supports Garmin Pay, has enough storage of 1,000 songs, and supports onboard full-color maps so you don't need to worry about getting lost when you're out for a run.

Garmin says that the 945 will be able to sort your recent workouts by activity and intensity, and just like the 245 series, the 945 can be synced with a Running Dynamics Pod or a heart rate strap for more insights into activity and fitness. It also seems to include more activity profiles than the other watches in the refreshed Forerunner line, so you can track your workout regardless of if you're running, skiing, hiking, or even golfing. Battery life clocks in at 2 weeks when used in smartwatch mode, 36 hours in GPS mode, and 10 hours in GPS mode with music.