You may not want to at first, but once you sit down, you’ll be much more likely to get some good work done.
The bottom line is this: the muses will not always come. There will be days that you don’t feel like working, and that’s part of being a human. But if you create and stick to a schedule, you’ll eventually train yourself to write when it’s time to write. You may not want to at first, but once you sit down, you’ll be much more likely to get some good work done.