The internet is buzzing about Pedro Pascal's fitness transformation as Mr. Fantastic in "The Fantastic Four." How did he do it? Well, I have a bit of an idea. In October, I arrived at Jason Walsh's private gym in West Hollywood.

Pedro Pascal took his sisters Lux Pascal and Javiera Balmaceda to the world premiere of "The Fantastic Four: First Steps" in Downtown Los Angeles on Monday night.

Pedro Pascal costars with Vanessa Kirby, Ebon Moss-Bachrach and Joseph Quinn in 'The Fantastic Four: First Steps,' in theaters July 25