For starters, I am my own guinea pig for exercises! I would never include something I haven’t tried myself in a client’s program. The example there, I guess, might be one of someone who is faithful to her word when I can reassure them that they can do this (since I know what it feels like!).
Of course, this goes straight into perhaps the more direct response to this question: I make time for my own workouts. This sometimes can be challenging given my demands and schedule. I let them know my personal philosophy (and often it rubs off:): that ANY mindful period of time where I spend moving my body is good, productive, and necessary. I find some clients still need the reminder that exercise does not always have to occur in one single bout; it can broken up throughout the day e.g., 5-10 minutes each x 3 or more times adds up to a great day of physical activity!