Southpaw is a fighting style where you are domaint with the left hand instead of the right. Below is a trailer with Jake Gyllenhaal, who also recently played in Nightcrawler and before that End Of Watch. Storyline seems to be that jake stars a rising boxer who is family and working on a title fight. Before he gets his chance tragedy strikes and he loses his wife. From there life spirals out of control. Watch the trailer below.