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It is certain that the introduction of stiffer shoes made possible new technical achievements not previously known , and that further achievements were the result of still more enhanced footwear worn by supremely talented dancers . " Apparently if you do n't give up and walk out in the middle of class , you've done well . " It is clearly part of the reason why I never learned ballroom dancing ; it 's the reason why I - - and all the boys - - resisted the folk dancing they tried to teach us in grade school ; it 's the reason why I would have screamed bloody murder if anyone had tried to make me take ballet at , say , the age of 10 ; and it 's the reason for the stunned silence that greeted me once when I happened to let fall to my colleagues that I was taking ballet classes . As choreography asked more and more of the ballerina she had to ask more and more of her shoes . Carlo Blasis , however , one of the great nineteenth-century masters , regarded adage as the very heart of ballet training .