they are constantly putting strain and stress on their bodies and their feet. A ballet dancer's goal is to make physically demanding choreography appear effortless. The upper body of a ballet dancer is prone to injury because choreography and class exercises require them to exert energy into contorting their backs and hips. Back bends cause the back to pinch, making the spine vulnerable to injuries such as spasms and pinched nerves. Extending the legs and holding them in the air while turned out causes damage to the hips. Such damage includes strains, fatigue fractures, and bone density loss. Injuries are common in ballet dancers because ballet consists of putting the body in unnatural positions. One such position is first position, in which the heels are placed together as the toes point outward, rotating, or "turning out" the legs. If First Position is done incorrectly it can cause knee problems, however, when done correctly (turning out with the hips rather than the knees) it should increase flexibility and reduce pressure on the knees. Meniscal tears and dislocations can happen at the knees when positioned incorrectly because it is easy to let the knees slide forward while turned out in first position. Ballet dancer's feet are prone to fractures and other damage. Landing incorrectly (not through the foot, with knees bent) from jumps and dancing on pointe may increase the risk of broken bones and weakened ankles where care and attention is not taken by a conscientious teacher or student. Tendonitis is common in female ballet dancers because pointe work is strenuous on their ankles. Landing from jumps incorrectly may also lead to shin splints, in which the muscle separates from the bone. Class time is used to correct any habits that could lead to injury. If the ballet dancer is properly trained, the dancer will decrease their risk of injury. Some ballet dancers also turn to stretching or other methods of cross training, like Pilates, yoga, non impact cardio, and swimming. This outside training, attempts to minimize the risk of bodily damage by increasing strength, exercise diversity, and stamina. These days ballet companies around the world pay a lot of attention to the prevention of injuries and a lot of ballet companies have in-house health suites providing facilities and expert guidance to dancers. Most ballet companies and ballet boarding schools alike also employ their own physiotherapist. The Australian Ballet invented a