Actress Priyanka Chopra Wednesday unveiled the trailer of her much awaited film “Mary Kom”. She plays the Olympic bronze medallist boxer in the biopic and described it her “hardest” work so far.

Produced by Sanjay Leela Bhansali and helmed by Omung Kumar, “Mary Kom” will have its world premiere at the forthcoming edition of Toronto International Film Festival (TIFF).

“This is my hardest film so far. Mary was the inspiration herself for me for the film,” Priyanka told reporters at the event here.

“We worked for 18 hours in cold, rains, and in very tough conditions. It was team effort and I am happy that Mary was overwhelmed and cried after watching the film,” added the actress.

The film shaped well, thanks to the support of Mary Kom, five-time World champion. Priyanka spent a lot of time with the champ from Manipur to understand the nuances, stance and style of a boxer.