Bollywood superstar Shah Rukh Khan says that though he has been grappling with injury problems, he is fit enough to do an action film. br br "When I was doing 'Chenani Express' I was injured, but I did it. It hurts a little, troubles you a bit, you need to be careful. If I am offered an action film, I will do it. There is no big deal about it. I am fit enough to do an action film again," Shah Rukh said here.