Because I don’t plan on being sick, i don’t have anyone fill-in. Vacations or trips are the same. Establishing RAPPORT with your clients is one of the best things you can do as a trainer. When you have that, and things come up, because they will on both sides, it won’t bring any hard feelings.
While you are out, you can simply give them an assignment and text or email you that is was done and how it went. And, of course, I don’t charge them for it. 🙂