And when they use trikes and bikes to jump from one building to another hundreds of feet in the air with no safety rigging or nets well, it's not for the faint of heart.
There's the requisite warning not to try this at home. And we do see injuries, including one serious accident.
But "Nitro Circus" is something closely akin to "Jackass," as Johnny Knoxville says on camera: "It's like all the same inbred family."
The "Nitro Circus" stunts are astonishing; the film's slim narrative less so. It's built as a series of flashbacks as the troupe prepares for its live Las Vegas debut and the build-up is better than the climax.
There are laugh-out-loud moments that happen while the stunts are under way; the attempts at scripted comedy fall flat.
And while we're repeatedly told this is an attempt to convince people that the stunts people have seen on the "Nitro Circus" TV series on Fuel TV and MTV since 2006 are special-effects free, the 3-D technology makes some of them look fake.
But the movie accomplishes exactly what the filmmakers intended entertaining people who are into this sort of thing.
"Nitro Circus: The Movie 3D"
This locally produced movie is filled with death-defying stunts that are entertaining even if they aren't smart.
Where • Local theaters
When • Opens Wednesday, Aug. 8
Rating • PG-13 for extreme-sports violence; some profanity
Running time • 85 minutes