The more obese someone is the weaker they become. They are more likely to have high blood pressure, blood clots, their immune system starts shutting down, they're always tired, breathing issues and so much more.
A.Musclar Balance Because it helps you with physical health.
These are all true but I do not know the last part of the answer
Doing research about the company that sent you an email will help you understand what you would be going into. Contacting them to verify will also help you be safe and not get fraud with anything.