Los Angeles. November 7 Actor Chris Hemsworth , who is playing superhero Thor, gained 20 pounds of muscle , is now working on losing weight by going on a crash diet.

The 30-year-old, who will be seen in “Heart of the Sea”, disclosed his back story of why he needs to lose weight for the film.

A bunch of sailors in a whaling ship get struck by a whale, they jump onto the small rafts as the ship sinks and drift for 90 days. And basically they begin to die and eat each other … a romantic comedy.

He additionally said, “And we have to get rather skinny. So we’re on 500 or 600 cal a day.