What is the biggest trait a personal trainer should possess? personality? seriousness but shows results? ADVERTISEMENT 1.60K viewsJune 12, 2011 0 Jonathan0 June 11, 2011 0 Comments 12 Answers ActiveVotedNewestOldest 0 Christine0 Posted 0 Comments be a great listener, be positive, upbeat, focused. and be yourself! Can’t go wrong. You are viewing 1 out of 12 answers, click here to view all answers. Register or Login