People use personal trainers because the trainer pushes you to make more of an effort - you'll do more push ups or another lap if someone is shouting at you. So we hire a trainer or a coach or a whatever it is that we are into in order to make us do more and whip us into shape. Effort is transitory and hard to measure and even harder to do on a regular basis so it requires oversight. But ultimately, if we only grow on demand are we selling ourselves short? Can the student ever really become the master if the master is there simply to keep us motivated? Are you really helpless without someone telling you what to do?