Backflipping is three times as much fun in Vienna when your friends come along for the ride.

Look, up in the sky! It's freestyle motocross supermen!

Eight freestyle motocross riders whip up the crowd in Vienna.

It's Austria, so naturally skiing was a hit -- combined with a bicycle flip.

In-line skater Chris Haffey flips into the action.

BMX riders and FMX riders fill the air during their combined stunts at Wiener Stadhalle in Vienna.

Josh Sheehan does a backflip during the Nitro Circus Live stop in Vienna.

"Nitro Girl" Jolene Van Vugt attacks the Gigant-A-Ramp in a Barbie car.

Big wheels keep on spinnin' during the Nitro Circus Live's European tour.

FMX riders double the action at Nitro Circus Live in Vienna.

Fire plus big wheels equals hot wheels.

The always popular cooler jump.

You just know it's driving Travis Pastrana crazy that he can't do any stunts while he rehabs his shoulder after surgery earlier this fall.

FMX riders perform a trick train.

Freestyle motocross rider Josh Sheehan says goodbye to some in the crowd at Vienna's Wiener Stadhalle.