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The Forerunner 255S offers up to 12 days of battery life in smartwatch mode and up to 26 hours in GPS mode, providing a comprehensive view of your health. This includes data on sleep, training, and overall wellness.

The morning report delivers a summary of your sleep, heart rate variability, and daily workout suggestion, all in one place, as soon as you wake up.

You can view your entire weekly schedule of suggested workouts, which adapt to your performance and recovery after each run.

New features for indoor running and treadmill workouts include improved pace and distance tracking. The watch also calculates running power using metrics such as ground contact time, stride length, and vertical oscillation.

The "store and forward" feature allows for heart rate storage during activities like swimming or team sports, and automatically sends the heart rate data at the end of the activity.

The "Physio True Up" feature stores steps, calories, intensity minutes, and all-day heart rate data when worn without a watch, and then syncs the data across all user devices via Bluetooth and Garmin Connect Mobile.