I see a wide variety of clients. Some are HIV positive, some weigh over 300 pounds, some have cancer, and some are older than 70 years old. Each of them is "fighting" something. Each come to me hoping that I can help them with their situation.
What I try to do is to make sure that the client has a realistic and optimistic starting point with regards to their pursuit of health. Each client starts at his or her own level, and honestly each has limits.
What I've noticed though is that most people underestimate their abilities. I consistently hear clients telling me they are too uncoordinated, or too weak, or too something.
We each have our limits, but please don't dwell on your limitations.
It's easy for me to say, but please appreciate that you have been given one more day to live, and do the best with what you have to work with. Each day give it your all. Train hard. Eat well. Pat yourself on the back in knowing that you are training, and that you are doing your best. Be kind to yourself.