Displays your current VO2 max., which is an indication of athletic performance and should increase as your level of fitness improves (Getting Your VO2 Max. Estimate).

Broadcasts your current heart rate to a compatible device (Broadcasting Heart Rate Data to Garmin Devices).

Displays your current fitness age, which is based on your VO2 max., resting heart rate, and body mass index (BMI). (Viewing Your Fitness Age)

For the most accurate fitness age, complete the user profile setup in your Garmin Connect™ account.