The use of an Agreement that outlines the details of our relationship as trainer and client. A health history, and fitness assessment. A PAR-Q form. A Physician Approval to Exercise form (where appropriate). Not taking on someone who I do not believe I am qualified to train. Full disclaimer/disclosure that I am not at any time giving the client medical or nutritional advice (as those terms are commonly understood and defined)… There’s much more that can be added here.