I went to see Pilobolus a few days before this, and met fight choreographers Jason Knox and Jess Mermelstein there.
They practice Parkour which is this really efficient way of moving through a city. Here's a really cool movie by Andrew Kornylak: http://vimeo.com/2541809
These folks practice at STREB in Brooklyn, NY. Some members from Pilobolus are part of the group.