Ride up to the object at a decent speed with your feet in Fs Boardslide position.  When your near the object, turn 90 Fs in order to slide perpendicular with the object.  It helps to keep your should square with the object.  Balance, and when your reach the enjd, twist your shoulders in the direction you want to spin, follow with your feet and spin 270.  It's tricky, but you'll get it.  Land and ride away.