Actor Sidharth Malhotra is leaving no stone unturned for his next project and will train in martial arts for the same. The 31-year-old actor had earlier took a training in martial arts for Brothers. Sidharth has been roped-in by Fox Star Studios to star in their next venture, an action film. Gossip mills are abuzz that it is a sequel to Bang Bang. ???We are doing an action film. It will be called something else. It is not related to the first part (???Bang Bang???),??? Sidharth told a news portal.