Sometimes hard to do, but worth heeding:
“Exercise the writing muscle every day, even if it is only a letter, notes, a title list, a character sketch, a journal entry. Writers are like dancers, like athletes. Without that exercise, the muscles seize up. ~ Jane Yolen
Yolen knows of what she speaks. She is an American writer of fantasy, science fiction, and children’s books, and is the author or editor of more than 365 books. Her best known is The Devil’s Arithmetic, a Holocaust novella.
There really isn’t much more to add to this admonition, because it isn’t a suggestion, it’s a warning. Your writing muscles will seize up, maybe even atrophy, if you don’t keep it up. This isn’t a problem for most of us who write professionally, especially now with computers making writing so much more convenient. But even a short vacation from writing can stop the natural flow of ideas and creativity, especially when working on a longer work, like a novel.
Writing should not be a chore. If it becomes tiresome, maybe a short break is in order. Go for a walk, to the gym, have a glass of wine with friends. And then go back, refreshed and ready to enjoy the gift that you have been blessed with.