Chritian Bale had to shed 62 pounds to portray the role of Trevor Reznik in The Machinist, whose severe insomnia and psychological issues lead to an accident

Heath Ledger locked himself in a hotel in London for a month, to play the iconic Joker which made him win Oscar for Best Supporting Actor

It took months for Kate Winslet, leave behind the character of former Nazi concentration camp guard played by her in The Reader

To portray his role in The Revenant, Leonardo DiCaprio slept in animal carcasses and ate raw animal organs

Randeep Hooda lost 18 kgs in just 28 days to look like a prisoner for the film Sarabjit. He went on a starvation diet

Ranveer Singh for Padmaavat went for the total isolation and locked himself in an apartment to play his character as Alauddin Khilji

Rana Daggubati for his film Haathi Mere Saathi, spent a fortnight with elephants in the jungle to get familiar with them

For film Dallas Buyers Club, Mathew McConaughey lost around 47 lbs to play AIDS afflicted person, Ron Woodroof

These actors truly showed their passion and hard work towards their roles by going to the extreme limits to look convincing on the screen