from the ranks of "how...?"

I discovered "Russian Bar" while watching America's Got Talent. And yes, I know. I watch for the danger tricks/magic tricks, okay?  Basically it's an acrobatic/gymnastic routine with extreme likelihood of death, at least from my vantage point.  Imagine the balance beam routine in gymnastics competitions (and yes, I picked the gymnast that I was "named after").  Keep in mind I already think the balance beam is very scary.  Now imagine the balance beam is made of rubber and bounces you thirty feet into the air.  The group on this season of AGT seem to be a lesser version of the group that performed on season 3 of AGT, the "Russian Bar Trio" from Quebec.  This is them:

Here's a routine done by Chinese gymnasts - look at how high she jumps around the 2:10 mark.  And look at the double-jumper thing at 3:10.  What the fuck, right?