title: What online trainers don't know can hurt you.
authors.forename: M B
authors.initials: MB
authors.lastname: Marcus
mesh_terms: D003376:Counseling / Q000592:standards; D015444:Exercise; D020446:Fitness Centers / Q000592:standards*; D006801:Humans; D020407:Internet / Q000592:standards*; D014481:United States; D014584:User-Computer Interface