Watch the Russian Bar Trio perform.
Christine, a former gymnast from Canada, flips and flies high in the air before landing on a bar that's only 4.5 inches wide. While it requires great skill to perform the acrobatics, Yves and Marco are the ones doing the heavy lifting.
"It's almost like a grand piano hitting your shoulder," Yves says. "Her body weight, with the g-force multiplies, ends up being about 500 pounds."