“Maybe we could recruit people like that to start training on it,” he said.

To demonstrate, Roberge hurled himself off the top of the wall, executing one and a half flips and a full twist before bouncing off the trampoline below and using the wall to propel himself upward into a double flip with a triple twist. Each bounce brought its own percussive whoomp that echoed through the building.

“Using the wall is very different; you have to be aware at all times of exactly where it is, and your timing has to be perfect,” he said.

Building an extreme sport from scratch is no easy task. First, there are the rules. The fewer the better, Roberge says. He and his fellow bouncers say that traditional trampoline, as practiced in the Summer Olympics, is constrained by specific moves and guidelines. They want to create a competition that is looser and open to innovation.

“In traditional trampoline, it’s almost like you need to be in the army to perform because it’s so strict,” said Oli Lemieux, a professional trampolinist who lives near Montreal. “This is much more freestyle. That’s why I like it.”

But Roberge, who trains with members of Canada’s Olympic trampoline team and is considered one of the country’s top bouncers, acknowledges that there must be an organized way to judge an event. He and his fellow trampolinist Ignacio Adarve have written criteria for judges to use to assign points to moves and tricks. In a typical contest, bouncers will perform a series of 10 consecutive tricks, each following a bounce on the trampoline. The highest marks will go to those who perform the most difficult acrobatics.