About the We Are Undefeatable app

Is the app free?
What is the We Are Undefeatable app?
Is the app suitable for me and my health condition?
Is there anyone who the app isn’t suitable for?
I keep seeing the name ‘Good Boost’. Who are Good Boost and what is their involvement?
Downloading the app

How can I get the app?
What devices is this app available on?
I can't download the app - help!
Using the app
