How PAI is calculated

When Personal Activity Intelligence (PAI™) was developed, it was done so with the primary goal of impacting people's long-term health. In the years following the HUNT Study, where researches found that PAI can help people live longer, healthier lives, we have discovered that the shorter-term benefits of using the PAI system—motivation, efficiency, and peace of mind—are as important as the life-changing long-term benefits that PAI offers. While PAI is a simple metric that leads people on the path to better health, the algorithm is based on 25 years of physical activity and health outcomes data of more than 45,000 people. So we've broken down the facts to help you better understand how PAI works, and how you can get the most out of it.

What is PAI

PAI stands for Personal Activity Intelligence; it’s a scientifically-backed metric that takes your heart rate during all activity (yes, even those that don't involve steps) to generate PAI. If you maintain 100 PAI throughout a rolling 7 days then you can gain protection from cardiovascular disease mortality and other lifestyle related disease mortality.

Validated by the HUNT study

PAI was validated using the HUNT Study at the The Norwegian University of Science and Technology. HUNT was one of the world's largest health studies ever performed involving 45,000 people. It was concluded that maintaining a 100 PAI over a rolling 7 days was associated with an average increase in life expectancy of five years compared to those who did not maintain a 100 PAI. To learn more about the HUNT Study, please visit

Getting started — your first 50 PAI

During your first few weeks of earning PAI, keep in mind that the biggest jump in PAI's health benefits will be between 0 – 50 PAI. Reaching 50 PAI can give you 60% of the risk reduction from lifestyle related disease mortality (with 100 PAI giving you 100% of the associated benefits). Even reaching 30 PAI will start to give you some of the health benefits of PAI.

As a starting point, 50 PAI is a good goal to aim for as you become familiar with how much PAI you earn from various activities and intensity levels. As you continue to earn PAI and maintain a Score of 50, you may find it more difficult to earn points from the same level of intensity.

The road to 100

While 100 PAI is the ultimate goal, don’t be discouraged if it doesn’t happen right away. It takes some people weeks, even months, to figure out the right mix of activity, intensity levels and duration to achieve 100 PAI.

It's good practice to keep track of which activities and at which levels of intensity give you PAI.

Continue getting PAI's benefits

100 PAI or above can give you 100% risk reduction from lifestyle related disease mortality. As your points go below 100, you receive a smaller percentage of the risk reduction.

If your PAI Score is above 100, whether that’s 150, 200 or even 300—while you aren’t receiving any more risk reduction from lifestyle related disease mortality (because you can’t get more than the most of anything)—there is still great value in knowing you’re getting fitter, feeling better, and doing everything you can to live a longer, healthier life!

PAI adjusts to your fitness level

PAI is the great equalizer; it’s based on each person’s physical makeup (maximum heart rate, resting heart rate, and the body’s response to exercise.) The activity everyone does to achieve their goal of 100 is unique to them.

The fitter you are the more effort it will take to earn PAI; conversely, the less fit you are, the less effort it will take to earn PAI (if all 'effort' is counted as equal). That's not to say it's easier for less fit people to earn PAI, but that PAI adjusts to each person's fitness level, and that's one of the great things about PAI—people are challenged at the appropriate level.

Why you need to wear a fitness watch to bed at least once

While you sleep, your heart rate monitor tracks your resting heart rate (RHR). This gives PAI your true resting heart rate which is a primary component of the PAI algorithm. Your RHR will change over time based on your activity levels. The fitter you are, the lower your resting heart rate will typically be, so it's important to wear your fitness wearable to bed at the beginning, and good practice to continue wearing it to bed so it can update your RHR.

How to 'bank' your PAI

Here's one last tip. Once you learn what works for you to earn PAI, you can start to ‘bank’ PAI by pre-planning.

If you know you are not going to be able to work out for a few days during the week, start scheduling in some extra activity in advance, giving you the peace of mind that you'll be protected for a few days and won’t feel guilty!

Any further questions?

If you have any questions about how PAI works, please don’t hesitate to contact us.

We’d love to hear from you!

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