While I was in Costa Rica in February, I let myself get talked into ziplining. If you don't know what ziplining is, it consists of a pulley suspended on a cable mounted on an incline. They are designed so you are propelled by gravity to traverse from the top to the bottom of the cable. They were probably originally created as transpsortation in the jungle but now are primarily entertainment for touristas.
Anyway, here's a short video of the "superman flight" of yours truly. So much fun! There were seven cables in all, but this was the only "superman" cable. The others have you in a sitting position with your hands lightly on the cable to slow down if necessary. With the superman position, you either keep your arms in front of you (faster) or straight out to the side. And to think I almost didn't try it!