
It starts out with the initial goal of earning 30 PAI per day and aims for the final goal of achieving 100 PAI per day.

As you do activities that increase your heart rate, you accumulate PAI. It uses your age, sex, resting heart rate, and past seven days of heart rate data to calculate your PAI, but it’s really just a metric that’s similar to Amazon’s Activity Points. Zepp Health uses PAI based on the research of Ulrik Wisløff, a professor at the Norwegian University of Science and Technology. Are your friends using the wearable or its app? Is the data easy to read and applicable to your life? Each fitness tracker also has one primary proprietary health metric, like Fitbit’s Daily Readiness score or Garmin’s Body Battery.

More than many other gadgets, how much you like a fitness tracker depends on how much you like its software.
