By consistently reaching 100 PAI, you can improve your cardiorespiratory fitness. PAI tells you how much activity you need to optimize cardiorespiratory fitness, but the activity that you choose is up to you. You can earn PAI by doing the things you already do, as long as they raise your heart rate. Walking to work, playing with the kids in the backyard, or skiing can all be ways that you earn PAI slowly.
To earn PAI more quickly, you can add some new activities or increase the intensity of the activities you’re already doing. Check out an indoor rock-climbing gym, take the stairs at work, or walk the dog along the hilly path instead of the flat one. As long as you continue to elevate your heart rate and earn PAI, you’ll reach and maintain the cardiorespiratory fitness level required to optimize your health benefits.