Pitt trained for months for the role, which demanded significant mountain climbing and trekking practice, including rock climbing in California and the European Alps with his co-star David Thewlis.
Pitt berlatih selama berbulan-bulan untuk peran tersebut, yang menuntut praktik trekking dan pendakian gunung signifikan, termasuk mendaki batu di California dan Alpen Eropa dengan rekan pemerannya David Thewlis.