What is the biggest trait a personal trainer should possess? personality? seriousness but shows results? ADVERTISEMENT 1.62K viewsJune 12, 2011 0 Jonathan0 June 11, 2011 0 Comments 12 Answers ActiveVotedNewestOldest 0 Sue0 Posted 0 Comments Professionalism- Education-Tenacity-Experience-Fortitude-Conviction-Mindfulness-Boundary Limits- You are viewing 1 out of 12 answers, click here to view all answers. Register or Login