There are five qualities used in the Russian national audition process, which is only Vaganova training. Accepted applicants must have 180 degree/flat turn out (think of a book opening) and easy rotation within the hips and ankles, 2) body proportion w low body weight /predicted appropriate height- (girls no taller than170 cm) 3) flexibity, 4) feet and 5) musicality/rhythm. These five tests are done to a selected group of students who then enter the Russian ballet academies at 10 years old and train for 8 years until 18. The examiners also look at the students parents for general information. The students must meet specific weight goals according to their height each year and are expelled if they deviate. A BMI of under 17 is ideal, which to the western eye appears anorexic, but is a gating item for entrance to the most elite schools and for keeping your spot, since it is very competitive each year to be allowed to move up. Other things, such as the size of one's head (small is good) the length of neck (long preferred) are considered. And the details of ones foot shape after the general assessment (arch, ankle and toes) are also considered. They look at a students bone structure- to jump, a light bone structure is optimal (bird bones) vs a more grounded skeleton such as a wrestler would have. Vaganova students in Russia are chosen from thousands of applicants, so other things- a symmetrical spine, natural balance and an ability to let music move through their muscles is also noted. Last, not least, an attractive face with mobile thateatrical qualities - especially having large- eyes will help.