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In Air Rotation

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 Any rotating mass has angular momentum.  This force is created
when torque is applied to the mass.  Arial skiers call this "contact
twisting", and is created by pushing off the ramp.  Once they
are in the air they cannot change their angular momentum. However,
they can control their moment of inertia by moving their arms and
legs in and out.  Aerial skiers further control their motion by
 performing a hula motion with their hips. To ensure sufficient
 momentum through the jump they raise their arms entering the ramp,
 distribution his mass away from his center of rotations, which is near
 his hips.  This act increases their rotational inertia, resulting in more
 rotational momentum. In the air they can speed up or slow down their
rotation by using the tilt method. They move their arms up or down
and forward or back, which tilts the body to one side. The more tilt,
the faster the spin, as more momentum is transferred.