I am a qualified GFI but I have a number of clients who want to work one-on-one, can I do this? ADVERTISEMENT 911 viewsMarch 8, 2017 0 Jackie March 8, 2017 0 Comments Do I have to gain a personal trainers certificate to work with individual clients, or can I use my experience as a GFI to develop a program for one client instead of a group? 10 Answers ActiveVotedNewestOldest 0 Kimberly0 Posted 0 Comments And this got a negative vote why???? You are viewing 1 out of 10 answers, click here to view all answers. Register or Login