DENVER -- If running up and over obstacles, including concrete walls and railings, sounds like fun, you could be a traceur practicing Parkour.

Parkour is defined as the art of movement but it's more about using the concrete block or staircase as a brace or vault to get over, around or through to the next step or block.

"It's the ability to go wherever I want," said Tyler Teigen, a 17-year-old who practices Parkour, or a traceur. "I don't have any particular rules, and there's no competition involved. Everybody is just a family."

He is one of a handful of students learning how to run up walls, land a back flip and use his arms to cross over an obstacle. That's a move called a Kong. Four and a half years ago, Teigen's instructor was nearly alone.

"When we first started there was maybe six to seven of us," said instructor Brian Taylor. "Now there's 200- to 300-plus and growing."

At 5280 Gymnastics at 10601 W. 44th Ave. in Wheat Ridge, classes to learn the Lincoln Loop take place amid other, traditional gymnasts.

"Good technique prevents injury, and that's what we teach here is good technique. It's easier to do a move if you know every working part of the move instead of just haphazardly hucking yourself into something. We learned the hard way by falling down, and we are here to prevent our students from learning the way that we had to learn," Taylor said.

It's not quite "free running" but many traceurs say they do both. And they do not want to see this discipline in the Olympics, or even the X-Games.

They simply push themselves and each other.

"It trains your body in so many different ways. It's air awareness. It's physically straining. Like, you get such a great workout," said 15-year-old Logan Breitweiser.

His mother can watch the training, up to a point.

"The move is gorgeous and I can see why he wants to acquire it. I just don't want to see his face that close to the wall. I don't want to see it," said Glory Breitweiser, while holding a 7-month-old baby girl. She said she doesn't think her daughter will be a traceur.

"No, I think she's going to be a singer," Breitweiser said.

After the moves are perfected, it's performed outside where anything can be a platform.

"I love it because, like outside, you really get to test how much perseverance you have," the teen Breitweiser said, as he prepared another acrobatic move at Skyline Park in downtown Denver.

"It seems a little dangerous. No one's wearing any knee pads or helmets or anything. But I think it's great for the kids. They have to be really, really strong. And it seems pretty disciplined, too, to practice all this," said lunchtime observer Melissa DiPaola.

Parkour is increasingly popular on the Internet and on YouTube, and is featured in the 2006 James Bond film "Casino Royale." But the danger factor is one of the first things you notice.

Yes, injuries do happen.

"In past 18 months, I've broken my arm. I've torn my ACL. I've dislocated my shoulder," Taylor said. "It's definitely a 'Do as I say, not as I do' type of situation."

But two parents of traceurs say they've been impressed with the preparation this group has done.

"I cringe to think about what could happen to him, compared to what happened to me, but I really feel confident with what he's doing," said Jeff Teigen, Tyler's dad. "There's a lot of focus on it. And that's really helped with his grades and everything."

Denver police tell 7NEWS there's nothing illegal about Parkour as long as one isn't on or damaging private property. Two local hospital spokewomen say their emergency rooms have not noticed an increase in Parkour-related injuries.

The Goodson Recreation Center in Centennial will add a Parkour class March 1.

Fees run from $58 to $75.

For more information, check out HybridFreeRunning.com and SSPR.org.