Saif Ali Khan is about to begin shooting for the next schedule of Kabir Khan’s film, 'Phantom'. And since some scenes in the film need him to flaunt a muscular body, the actor has embarked on a new fitness regime. A source says, “In the next schedule, Saif has to do some high-octane stunts. Keeping that in mind, he has been working out twice a day. The actor even cut short his lunch break on the sets of 'Humshakals' in a bid to make more time for exercise. He does not want to take it easy now; rather he is very keen to get a muscular body in time for the 'Phantom' shoot.”