such as correcting bad posture due to upper crossed syndrome, do you design a program that focuses on exercises that strictly work the back and shoulders, or do you just give them a full body workout instead? Same question with a client with specific goal in mind, such as tightening up glutes and thighs, do you give them a workout that consists of just exercises for the glutes and thighs, or do you give them a full body workout and just include 1 or 2 exercises that focus on glutes and thighs?
if a client comes with specific requests, or if the assessment identifies certain postural deficiencies, such as upper crossed syndrome, then I would NEVER just work on those parts alone that would be in the corrective exercise program for the identified problem.
I would certainly focus on those areas with exercises that go from the isolation to the integration in proper progression but I would embed this within the framework of an entire body workout.
If a client came to me asking only for exercises for glutes or the infamous ‘outer thigh’, for example, and would not want to do anything else, I simply would not work with that person. Particularly with resistance training, it is just as easy (and probably easier) to train people into imbalances than getting them out of it. I would feel that I would not act in the best interest of that person even if s/he may not agree or understand it.