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In order to dance professionally, you have to start at a young age. No matter what, your muscle structure and your bones have to be groomed from a very young age. Nobody wakes up at 17 and decides to become a ballet dancer. I'm saying that and someone's going to be born tomorrow who decides to do that and I'm going to have my foot in my mouth.

Source: collider.com
In order to dance professionally, you have to start at a young age. No matter what, your muscle structure and your bones have to be groomed from a very young age. Nobody wakes up at 17 and decides to become a ballet