He overcame stammering; witnessed his father's failure as an actor and producer and his surviving a gunshot wound; saw his sister battle cancer; underwent a near fatal brain surgery; and has faced a broken marriage with his childhood sweetheart. Yet Hrithik Roshan calls his journey a 'fairy tale' and says it is life's adversities that build a man's 'mental muscle'. One look at the actor's washboard abs and chiselled physique in his forthcoming film 'Bang Bang' and you can guess the strenuous gym routines he must've followed. But during a telephonic chat with IANS the 40-year-old son of filmmaker Rakesh