Technically, since this is a YouTube video, I guess I should say "Watch this." But you get the idea.
This is Eric Witchey doing a short video on writing practice: Eric Witchey, Five Minutes on Writing. It's genius. If you follow this advice and no other you will improve your writing. You'll be a better writer, a more regular writer. This is great stuff.
And if you ever get a chance to go to one of his conference presentations/classes or take a workshop with him, do yourself a favor and do it. He's not just a prolific writer, he spends time analyzing why things work in writing, and he's very good at explaining it to others.
Go watch the video. Then go write!