I used to say that. Now I'm just stinkin' determined. I have days like that where I wake up and do not "feel" like going to workout, but then I get inspired knowing that the women I work out with are probably getting up exhausted also and doing it ANYWAY.
What are your reasons. Who do they beneift? It the answer is something other that for yourself, then i think it's time that you re-evaluate what you want out of being fit. Don't think of it as being selfish. Think of it as a way to inspire. By dedicating fitness to yourself it can open doors for others to see the capabilities that they may possess themselves.