Sources say Katrina is expected to be seen doing stunts and for this she has stepped up her workout regime to fit the bill.
A source says, "Katrina is going all out to prepare for her role. Since the last few days Katrina's trainer who has come down from London has upped her training schedule from two hours to five hours. She is being trained for her stamina, resistance and strength. She needs to be in peak shape to perform her scenes."
While for a layman, five hours may seem too much but Katrina is a sport. "Katrina's trainer has divided her workout into two schedules. During her break, she finishes her meetings and sometimes even squeezes in film dubbings," adds the source.