did the cast of everest really climb
The film's A-list stars, including Jason Clarke, Jake Gyllenhaal, John Hawkes and Josh Brolin, trained to climb like their characters did, and did plenty of filming actually on Everest. The actors endured altitude training (Gyllenhaal and Brolin purposefully did a little too much training and got weird), filmed in -22Â°F (-30Â°C) weather and spent plenty of time in close quarters with their cold co-stars.