Inspiration in a Google Search
First, look at pictures of people with great physiques, like the pictures in the illustrated exercises section or those you might find with a Google image search, for example. Go from picture to picture and try to understand that the people in those pictures felt like that at one point too, but they continued to train and are now great athletes and bodybuilders.
No matter how great they may be today, every single one of them started off with nothing in the way of strength, size, or conditioning. We are all born pretty much the same. It was through work in the gym that they got to be like they are: strong, healthy, fit, etc... At the very least, it's how they manage to look so good! Keep that in mind if you don't feel like training.
If you do this, it is my experience that you will not be able to wait to go to the gym so you can actually be like you want to be! Perhaps one day people will see your picture in a Google search!