Casting Jaden Smith was a double-edged sword. On one hand, he had natural charisma and athletic ability; on the other, he had the burden of being "Will Smith’s son." The 2010 Karate Kid served as his true breakout role, requiring him to carry a massive blockbuster on his small shoulders. At just 11 years old during filming, Smith delivered a performance that was surprisingly mature and physically demanding.
Jaden trained for three months in the United States and continued for another four months in China. His regimen included three to five hours of daily practice in martial arts, flexibility, and strength. the karate kid movie jaden smith
For his lead performance, Jaden earned a reported $1 million base salary , which increased to roughly $3 million after box office bonuses. Casting Jaden Smith was a double-edged sword