In addition, some researchers have noted that intensive training in ballet results in lower bone mineral density in the arms.Most ballet choreography is written so that it can only be performed by a relatively young dancer.33 The structure of ballet in which a (usually) male choreographer or director uses (mostly) women's bodies to express his artistic vision, while ignoring, objectifying, or silencing the women involvedclarification needed has been criticized as harming women. More Info below.