The official trailer of the Aamir Khan starrer film 'Dangal' was released on Thursday. Directed by Nitesh Tiwari, the biographical sports drama features Aamir as wrestler Mahavir Singh Phogat, who taught wrestling to his daughters Babita Kumari and Geeta Phogat. The film, starring Sanya Malhotra as Babita and Fatima Sana Shaikh as Geeta, is scheduled to release on December 23.