These are called "Fulls" "Full Elevators" "Full Extensions"
"Extensions" and numerous other things. There are several differnt variations, such as the
half in, the quarter turn full, the full turn full, the three-quarter turn
full, the flatback, etc, but the basic full is preformed in this way.
The two bases will stand facing each other, there hands cupped for the the flyer's foot.
The flyer will place her hands on the bases shoulders, standing up-right so that she can fully
push off their shoulders into their hands. The back-spot will stand behind the flyer with her hands
on the flyer's hips/waist area. The flyer will prep, tucking her knees to her chest, keeping her back straight,
and place her feet in the base's hands. The bases will then push with their legs and straighten their arms above their heads,
locking out their elbows. The flyer will "ride" their push into the position, and then hit her motion.
The back-spot has to follow the flyer's legs up as high as she can, grabbing the flyer's ankles, or the base's wrists.
These are called "Liberties". "Libs" for short. They are part of the one-legged stunts, and require a different load.
One legged stunts are preformed differently than two legged. The flyer stands with one leg up, prepped to be grabbed. The main base will grab the heel and toe of that foot. The secondary base grabs the middle of the flyer's foot, and underneath the hand that has the flyer's toe-for a little extra push. The back-spot will squat below the flyer, placing one hand on her rear, and one on her ankle. The bases need to remember to push through their legs and not from their backs. On a pre-determined count everyone will dip, the bases pushing through their legs and straightening their arms. The flyer will hit her desired motion with her free flying foot, and the spot will push up through the flyer's bottom and hold on to her ankle to keep it steady. The bases lock out their elbows and stand "kissably close". All other one legged stunts are preformed in this fashion.
These are called Arebesques. The flyer simply extends her leg up behind her as high as she can without leaning forward.
This is called a HeelStretch. The flyer should pull her free-flying leg up as high as she can, without leaning to the side. She should grab on her calf or her foot, whichever she can reach.
This is called a Scorpion. There are several ways to preform scorpions. The object of a scorpion is to get your leg as far back behind you and as close to your head as possible.