Many skaters have performed a Biellmann variation in which the free leg is brought down towards the face, with the knee bent inwards. This spin has mostly been performed by Junior-level or Junior-age skaters, because this is easiest to perform before puberty. It is unknown who invented this variation. It was performed by Naomi Nari Nam at the United States nationals in 1999. More recently it has been brought back by Junior level skaters including Caroline Zhang of the United States who performed the spin on her way to winning the 2007 World Junior title.