Tricks.

Rotation Tricks.
Backflip – A trick first performed by Carey Hart, once the Holy Grail of Motocross, now is a very common motorcycle trick having many variants. It involves the rider rotating the motorcycle backwards until they have done one full rotation. Variants of this trick include any of the regular tricks, whilst doing a backflip. When naming the trick, the regular trick, for example a Can-Can, is said followed by ‘Backflip.’ E.g. ‘Can-Can Backflip’.
Double Backflip – Once thought to be impossible, it was performed first by Travis Pastrana, once at Spokane, Washington when filming for Travis and the Nitro Circus 3 and again at Summer X Games 12, Moto X Best Trick. It involves a rider doing two backflips during a jump. This tricks requires the rider to go twice as high and twice as far to achieve these rotations. Other notable people who have attempted this trick include Scott Murray, who crashed attempting it at Summer X Games 13 Moto X Best Trick, but later achieved it at an Italy supercross Event. He also performed the stunt at various Crusty Demons tours.
360 (Mulisha Twist) – Perhaps the hardest trick to identify, because of its name. It is when the rider spins the bike 360 degrees. It was first performed by Brian Deegan, leader of the Metal Mulisha, hence its other name. Some believe Deegan had performed an Off-Axis Backflip or 360 Backflip because of its noticeable vertical rotation. Many riders have attempted this trick, only a couple riders have done a variant of this trick which include Nate Adams (Nac-Nac), Travis Pastrana (One Handed) and Blake ‘Bilko’ Williams (HeelClicker).
Underflip – When the rider does a backflip, but moves the bike perpendicular to the ramp when upside down. Created by Norwegian rider Ailo Gaup, it is one of the newer Flip Tricks. Notable riders that have performed this trick include Mat Rebeaud, who did a motorcycle ‘Nac-Nac Underflip’ at Summer X Games 12 Moto X Best Trick
WhipFlip – When the rider does a ‘Whip’ during a backflip, not to be confused with an ‘Underflip’, as a ‘underflip’ is moving the bike perpendicular to the ramp as soon as the rider leaves the ramp, where as a Whip can be performed at any time during a Whipflip.
Barrel - Similar to the airplane stunt 'Barrel' (no evidence of being performed by anyone, attempted by Mad 'Mike' Jones at X Games Moto X Best Trick, 2003) consists of the rider moving the bike 360 degrees horizontally, not to be confused with an ‘Underflip’.
Frontflip - Only attempted into water or foam pit. Consists of the rider pushing forward on the bike, rotating it verticalled frontwards then landing it.
Transfer - (not a rotation trick) By displacing body weight over the bike and using gyro movement of the wheels the rider makes the bike fly on a curve trajectory, thereby transferring the bike to another landing spot. Often used when motorcycle freeriding to curve to a landing. 

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Body Variels.
Carolla – A trick first performed by Chuck Carothers, where the rider does a superman, then spins their body around 360 degrees parallel to the bike. This trick has only been done once at Summer X Games 10 Moto X Best Trick.
Volt – Another body variel, invented by Kyle Loza but attempted by Travis Pastrana, is when the rider moves above the seat and spins their body 360 degrees.
Body Flip Variel (Gregg's Flip Variel) - The motorcycle rider backflips only his body and then grabs the bike by the seat.