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Most of the trainers I know do use a service agreement, though it may differ in how it is done if they are independent or if they work for a company. The best answer you will get is to find people you are likely to hire…. in your area, in your price range, with the experience and skills you need, …. and question that group about policies and pick the one that works best for you.
I always do for a personal training client. Part of my contract are an Informed Consent, a medical, an exercise history and a physician’s approval, if necessary. The contract spells out my obligations and that of the client, a cancellation policy and the payment arrangements.
I also conduct MELT group classes from time to time which are not personal training. For those, I only require the completion of an Informed Consent.
I go over and fill out paperwork with every client that includes risk and release, health history, physician clearance or the client declining to get pre-activity physician’s clearance (which if they refuse to get clearance and have answers indicating the need for this on their history/PAR-Q, I recommend they seek another trainer), terms of payment, scheduling agreement/cancellation agreement, and a form for determining the type of program that they are interested in being provided.