The Garmin Forerunner® 225 GPS Running Watch is the first Garmin GPS running watch with wrist-based heart rate¹. Now you have the option to run without a heart rate strap because this watch has a built-in sensor using Mio Heart Rate Technology that measures heart rate at the wrist. Forerunner 225 uses an optical sensor (using Mio Heart Rate Technology) that shines light into your skin and then measures the amount of light returned. Because there are slight changes as blood pumps through your wrist, the sensor detects those changes and uses a sophisticated filtering process to determine your heart rate. A light seal on the back of the watch blocks out ambient light to help ensure proper heartrate detection.

In addition to using GPS to calculate distance and pace, the 225 has a built-inaccelerometer. This allows it to capture distance and pace data when you’re running on an indoor track or treadmill, with no need for a separate foot pod accessory. It even doubles as an activity tracker¹, counting the steps and calories you burn all day. Plus, it will remind you to move if you’ve been sitting for more than an hour. When you get that cue to move, just walk for a couple of minutesto reset the inactivity indicator.

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