You can get acquainted with a special set of exercises to improve turnout from Russian ballerina Maria Khoreva.
In ballet, turnout (also turn-out) is rotation of the leg at the hips which causes the feet (and knees) to turn outward, away from the front of the body. This rotation allows for greater extension of the leg, especially when raising it to the side and rear. Turnout is an essential part of classical ballet technique.
Turnout is measured in terms of the angle between the center lines of the feet when heels are touching, as in first position. Complete turnout (a 180° angle) is rarely attainable without conditioning. Various exercises are used to improve turnout by increasing hip flexibility (to improve movement range), strengthening buttocks muscles (to enable a dancer to maintain turnout), or both.