Caring more than others care about themselves can be SO FRUSTRATING!!!  And it can lead to burn out as a Personal Trainer.  Before you throw your hands in the air and walk away... dig deeper!  If someone isn't helping themselves, find out why!  If they're not following the program, doing the actions you know would help, find out what is getting in the way and then make a program for that!!!  Dig deeper, get to the root of the issue, and their adherence will skyrocket!