Dancing Feet

I was at dance class. There was a "local celebrity", a news anchor or something like that, taking dance lessons the same time I was. They are doing something like a "Dancing With the Stars" fundraiser later this year, so a lot of them are in to practice/learn how to dance.
She was in practicing the tango. She was wearing perfectly nice shoes. The weather outside was fine, sunny and dry.
So why o why did she take off her heels to put these on?