8. Jake Gyllenhaal Took Up Boxing for Southpaw
Jake Gyllenhaal’s transformation for Southpaw was intense and physical. He trained extensively under professional boxing coaches to learn everything from footwork to punching technique.
The months of conditioning changed his body and mindset, allowing him to convincingly portray a boxer struggling with personal demons. Gyllenhaal’s dedication gave the role emotional depth and authenticity, making it one of his most memorable performances.