You learned real fast as a dancer how much was the right amount to put on your shoes, because if you didn't put enough on, you were probably going to slip due to the low friction between your shoe and the stage.
Da ballerina imparavi molto in fretta quanta pece mettere sulle scarpette, perché se non ne mettevi abbastanza, sicuramente cadevi per via del pochissimo attrito tra il palco e le scarpette.