At first glance, aerial fitness might seem like one of those things your best friend tricks you into doing for a good laugh. Or one of those workouts only the professional dancers/trapeze artists among us can do, you know, to casually keep their muscles moving on their off days. A circus act. Walk into a loft-style room with 10-foot-long silk hammocks hanging from the ceiling, and your first reaction might be Aw hell no/Yeah right as you back up slowly for the door and get ready to run before the instructor makes eye contact.