Writing Exercise

I came up with a word count writing exercise for myself the other day.  I've picked an idea I had for an original fairy tale and each day I write an increasing number of words on the story.  So the first one I wrote 100 words, then 200, then 300, and today 400.  Tomorrow I'll write 500 words and then the next day I'll write however many I need to get to 1667 words.  It's going pretty well.  I like the story (The Tale of the Prince and the Schoolteacher) but I'm just now getting to the plot and I have two segments left to write.  Granted, the one tomorrow will be longer but I've still got a lot to fit in.  Oh well.  We'll just see how it turns out, I guess.