Ending a working relationship with a personal trainer should ideally involve open communication. If you have concerns or issues with their training style, approachability and honesty are key factors for resolving them amicably. Begin by scheduling a meeting outside of training sessions and respectfully express your reasons for wanting to part ways. It's essential to clearly communicate why this decision is being made so both parties fully understand the circumstances involved. It's recommended to offer constructive feedback that could potentially help the trainer improve as well. However, if there has been a severe breach of professionalism or trust that cannot be resolved through discussion, terminating the relationship without further engagement may be necessary for your personal well-being and progress towards achieving fitness goals.