It's very common for fitness trainers to hear these sorts of comments after they explain to the client what needs to be done to get fit. It's hard work and many people "want" to be fit, but balk when they see the work involved.
Goal setting is something that most of us have learned to do in school and on our jobs, but I was really surprised when I went to a marriage counselor years ago who advised me to set some goals for my marriage as well. It was a valuable exercise because it made me look at what areas of my relationship were good for me, what areas I could improve on and what mistakes I had made that I didn't want to repeat. Also, it gave the counselor a platform to help me work on those areas of myself and hence my relationship(s). The same methodology is used by fitness trainers all the time.
Re-evaluateLearning from successes and mistakes is the key here. Just like your job or relationships, your body will change and so you will need to make changes. As you get fitter, you will be able to handle more intense workouts. If you get injured or develop illness, you will need to change your workouts to accommodate the injury.
