Privacy Statement

123 Sync for Google Fit use and transfer to any other app of information received from Google APIs will adhere to Google API Services User Data Policy, including the Limited Use requirements. 

Or in more simple words: 

View and manage spreadsheets that this application has been installed in

• https://www.googleapis.com/auth/spreadsheets.currentonly

• The Google Spreadsheet™ Editor add-on uses only the spreadsheet that the add-on is installed in.
  
  

See your heart rate data in Google Fit. I consent to Google sharing my heart rate information with this app.

• https://www.googleapis.com/auth/fitness.heart_rate.read

See info about your body measurements in Google Fit

• https://www.googleapis.com/auth/fitness.body.read

Use Google Fit to see and store your physical activity data

• https://www.googleapis.com/auth/fitness.activity.read

• Add-on will only read your heart rate, same for weight and your steps. Hence it needs read access to your heart rate data, body measurements, physical activity data.

Connect to an external service

• https://www.googleapis.com/auth/script.external_request

• For doing this it needs access to the external Google Fit service. Google Fit is the only external service in use.

Allow this application to run when you are not present

• https://www.googleapis.com/auth/script.scriptapp

• Optionally you can create a periodic schedule to update your sheet.

Display and run third-party web content in prompts and sidebars inside Google applications.

• https://www.googleapis.com/auth/script.container.ui

• As it is an Google Spreadsheet add-on it will display a sidebar in the spreadsheet and show relevant prompts.