Most fitness apps have never heard of a rest day. PAI knows you're busy and lets you decide when to exercise, giving you a full 7 days to reach the goal of 100 PAI. The rolling 7-day period allows you to live your life without having to obsess over exercise, while also encouraging you to be mindful of when you need to get moving.
You don't need to exercise every day to maintain a healthy heart, but studies indicate you should be exercising more than once a week. That's why PAI doesn't care when you exercise, as long as you elevate your heart rate enough.
The science underlying PAI shows that maintaining 100 PAI is enough activity for optimal heart health, reducing your risk of cardiovascular disease mortality by up to 25%.