Begin by standing with one arm locked out against a wall or stable pillar.
Elevate the opposite arm and push as hard as possible towards the ceiling.
Lift the opposite leg of the arm against the wall as high as possible out to the side. Squeeze the outside hip as hard as possible to lift this leg, while keeping the ribs in and shoulder elevated. Resist moving anywhere else in the body.
Repeat for 10 controlled repetitions, followed by a 10-second static lift with the leg as high as possible.