Kang Sue-Jin is one of the world's greatest ballerinas.
She's currently stars as the principle dancer at the Stuttgart Ballet.
As you can see by this photo, ballerina's feet go through pure torture.
Regardless of whether you argue ballet's standing as a sport, you have to respect the commitment of the dancers.
They're forced to cram their feet into incredibly tiny, constrictive shoes before contorting their feet into a variety of painful positions as they perform.
Which brings us to our next photo…