For the best method to restart: The Smart should be restarted while plugged into a USB wall outlet adapter.  Any USB adapter from a smartphone or e-reader will work.

To restart your Striiv Smart:
   •   Keep your Smart plugged into the USB cable and the wall charger.
   •   Hold in the power button (on the top-right of your Smart) for a full 20 seconds.
   •   After holding for 20 seconds, release the power button.
   •   Press the power button once more (normal press) to turn your Smart back on. You should see the green "warming up," "stretching," and "let's do this" screens before your home screen is shown.