I Googled 'exercises in writing' and found a few dozen exercises that I can start with. Some of them give the first line and ask the writer to write for 20 minutes, kind of a stream of consciousness exercise. Some of them suggest that the writer take a published writing and convert it to a different genre. So, some will be quick and probably not as well written; others will take awhile, but will hopefully be better.
At any rate, I'm looking forward to the challenge. I find typing therapeutic. And I find writing therapeutic. I like making up characters the most, but I'll work on other aspects of my writing as well. Check it out every once in awhile.