The Centers for Disease Control and Prevention (CDC) recommends 150 minutes of moderate physical activity per week to reduce disease risk. But regular, daily walking—to and from the door of the grocery store, or out to the mailbox and back—isn’t usually fast enough to raise the heart rate to "moderate" levels.
So while it’s good that you’re active, those steps don’t "count" towards the CDC recommendations.
To get to "moderate" activity, you’ve got to increase intensity—that is to say, it's time to pick up the pace.
In one review of 38 different studies, scientists determined that a pace of 100 steps per minute met the scientific criteria for "moderate" intensity. Do that for 20 minutes per day, and you’ll hit 2,000 steps, which means you've almost met the 150-minute threshold.