Whether you want to use your Android device to track steps all on its own, or connect a fitness band to Spire you need to ensure that you connect Google Fit to Spire.
When you first install the Spire app you will be prompted to connect to Google Fit.
Did you skip this step when you first installed the Spire app? No worries! You can still connect manually:
On your Android device from the Spire App tap the three dots icon in the top right. Select "Settings." Under the "Fitness Tracking" section toggle on "Google Fit Integration." Choose the Google account you want to use, and you are done!