The biggest motivation for my clients has been the change in their body composition, and the physiological changes. Most people who quit, quit in the beginning stages of their exorcise program, before they see changes. It is my job to reassure them that the longer they stick with it, the easier it will become, and the more changes they will see. As a trainer it is just as important to be understanding and sympathetic to every clients situation, and as they go forward, show lots of praise for success. Setting a few major goals to achieve over an extended period of time, and many small goals that eventually add up to those major ones. By seeing the progression they are constantly motivated to move forward.