In order to be strong, you need to feel strong. In order to be happy, you need to feel happy. In order to be rich, you need to feel rich.
We often think reaching some goal will give us a good feeling. And we tend to focus solely on the actions we think we have to perform to reach that goal. You will work hard and the reward may very well be shortlived and less fullfilling than you hoped.
Try turning it around. First tap in to the feeling you hope to get from reaching your goal. Then perform the actions. The work will feel more easy and satisfying. You are now enjoying the process itself.