Whether you want to use your iPhone to track steps all on its own, or connect a fitness band to Spire you need to ensure that you connect Apple Health to Spire.
When you first install the Spire app you will be prompted to connect to Apple Health. We recommend turning All Categories On.
Did you skip this step when you installed the Spire app? No worries! You can still connect manually.
On your iPhone open the "Health" app on your phone. Then go to the sources (on the bottom). Tap "Spire" and make sure "All Categories On" is selected.