Jeff has to find the exercise component that personally gives him the greatest satisfaction and exhilaration and that is relevant to strengthening his back. Finding an activity that is enjoyable for him to engage in and seeing definite results will merge the subjective and extrinsic approaches causing Jeff to retain the motivation to engage in this exercise on a long-term basis.

Factors primary to the enjoyment of the physical activity are that they must provide Jeff with evenly matched challenges -- it must be neither too difficult for him nor too simple, so that he will neither be discouraged nor bored. He must, also, receive clear goals and feedback so that he will best know how to practice the exercise. Feedback will focus on praise with the intention of reducing Jeff's aversion to physical activity. Goals are particularly important in Jeff's case given his low level of self-efficacy. Finally, Jeff must be given a sense of competition, so that he will begin to associate exercise with excitement. In this way, Jeff's prior associations of exercise as tedious and not enjoyable will, hopefully, be reversed so that his approach to exercise will determine in a positive manner his resolution to incorporate at least some of the activities in his post-therapeutic life.

Subjective experiences are important, therefore Jeff's exercise regimen will incorporate sensations and perceptions -- a...

In other words, Jeff will be clearly informed on how the activity that he is practicing is rehabilitating and habilitating his back. In this way I will combine an interest of Motor Behavior (I.e. The study of how motor skills are initiated, controlled, and developed) together with its closely related discipline Biomechanics (i.e. A knowledge of the mechanical principles of physics and engineering applied to the functioning and structure of organic and sentient beings; here the emphasis would be on human movement and the structure and function of the body).
Given that Jeff works as a furniture-mover, I might focus on exercises that are particularly relevant to Jeff's social context (thus employing there extrinsic apparoach0 so that he will be further motivated to maintain his program. Another objective in doing this, is that Jeff, by incorporating exercises that are meaningful and enjoyable to him, will become engrossed in them and he will thus internalize them as part of his life.