I find that people generally don’t like to be told what to do. I also find that many people have their own answers. We as fitness professionals must be skillful enough to ask the right questions so that our clients can ask the right questions of themselves.
Too, people don’t change unless they have compelling reason to change. In addition, if they are not ready, willing and committed change is not likely to happen.
You might want to revisit Prochaska and DiClemente’s Transtheoretical Model Stages of Change. This will give you some direction as to how to go about determining the level of your client’s readiness as far a adopting a new behavior like working out.
Hope this is helpful to you.
Best to you.