There are templates on almost every fitness certifying organization website for this purpose. I do not know if you have to be a member or possess certification through the provider to access the forms. There are forms on this site for fitness assessement data and a “workout builder” system. Again you may need to be a member to use them.
I also teach certification prep courses, though the course is a private instruction program. My students design workout programs for each other using assessment data as part of their practical experience. We cover program design in class and they have access to relevant research regarding sequencing of each component of a single workout, implementing progression/regression strategies, periodization, etc. They are encouraged to create their own workout logs and forms, but are permitted to use forms from fitness sites (as they would be able to do so once certified). The work that goes into figuring out how to create a workout and why the various exercises are to be part of the workout goes a long way to helping the students understand their role as fitness professionals. The course aims to provide the students with the ability to individualize program design for very specific client needs and goals. But it also teaches students to start from the foundational movement abilities of a client and begin by addressing movement issues and imbalances.