Colombian twins Alejandra and Andrea Salamanca took the internet by storm with their sexy ballet dance to Daddy Yankee’s recent hit 'Dura.' The sisters talked about their success with the #DuraChallenge and showed their moves at their 'Up Stage' studio in Cali. Dancing on the tips of their toes, the identical twins mix classical ballet with latin-infused pop to create a viral sensation. Through various shares and repostings on Instagram, the video has now been viewed more than 7 million times.