What is the hardest exercise to teach? ADVERTISEMENT 1.32K viewsJune 14, 2011 0 Shane June 14, 2011 0 Comments Hardest exercise to teach to clients. 15 Answers ActiveVotedNewestOldest 0 Shane Posted 0 Comments Any sort of deadlift or good mornings. People just find it hard to use there hips instead of there knees, in my experience. You are viewing 1 out of 15 answers, click here to view all answers. Register or Login