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

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

tkhunny · Answer

1) No work shown.

What are the downsides to each of the four sources?