A passcode may be required to be set on the Athlete App depending on how your account is set up.
Via Administration - Configuration - Team Settings on the web platform, users with permissions can determine whether a passcode is disabled, optional or required when logging into the app.
After logging in, set a 6 digit passcode.
This passcode is an extra layer of security and will be required each time the app is opened fresh. If the app is open in the background of your phone, the passcode will not be required.