....is not stressful or taxing if you have worked through the beliefs, self-talk and schema, and the associated emotions, that lead writing to feel like work. When you write in a sustainable manner on most days, writing can nurture your life. When it becomes free of judgement and expectation, when you use carefully crafted processes that work for you, it can be a pure joy, or at least a "neutral" activity.
And if you have not achieved this state? Please, don't write on weekends.
Until you do.