Question

Which of the following would be the most reliable source to consult when creating a safe strength training routine?
An article published by a physical therapist
A program recommended by a pro athlete
A video showing army boot camp exercises
A list of exercises a friend already uses

Answer 1

The most reliable source to consult when creating a safe strength training routine would probably be "An article published by a physical therapist," since these people are professionals. 

Answer 2

An article published by a physical therapist would be the most reliable source to consult when creating a safe strength training routine