Phat do you have one of those yoga balls? The air hump is a pretty intense butt-burner. You put your feet up on the ball and your shoulders on the ground and then you make like you're trying to hump the ceiling. Also, rollerblades h:

Side note, I went on my first night time run in a few weeks... went better than expected. It think I'm gonna try for three runs this week since my schedule has been so nuts for so long. I need to get my shit together again.