India, April 23 -- Kartik Aaryan's physical transformation in Kabir Khan's sports drama Chandu Champion stunned both the fans and critics alike. His look and performance as a professional swimmer and professional boxer was considered outstanding. Filmmaker Mahesh Bhatt's son Rahul Bhatt, who had trained the actor for the part, got candid in a recent interview spilling the beans about his equation with Kartik.

(Also read: Alia Bhatt is 'paani kam chai' in front of my real sister Pooja Bhatt, says half-brother Rahul Bhatt)

In an interview with Hindi Rush, Rahul explained how Kartik pulled off from a lean figure to ripped athlete. "He didn't have any foundation in strength training. He also had to do boxing, which is a different skill set....