This is the place to post questions and discussions on usage and style. The members of the Wordwizard Clubhouse will also often be able to help you to formulate that difficult letter.
1-He does aerobic exercises for weight loss.
Does that mean
a-There are certain aerobic exercises that are for weight loss and he does them
b-In order to lose weight, he does aerobic exercises.
If we wanted to say "in order to lose weight", we would probably say "he does aerobic exercises to lose weight."
So it would probably have your meaning a. But theoretically, it is ambiguous.
Signature: Phil White
Non sum felix lepus