We see someone's sex as an important predictor of their abilities and interests. We assume that men are more interested in physical activities and sport such as football, rugby, weightlifting, golf etc. The reason we make this assumption is because of the general physical appearance of a man. Men are generally bigger than women in height, physique and width, and we therefore assume that men are more dominant and more powerful than women. Where as women are generally smaller in height and are slimmer. Women are seen as the more weak gender and although they like to stay fit and go shopping, they are seen as the household cleaners. Therefore we assume that they are more into doing things like cleaning, jogging, socializing, shopping etc.
Gender stereotype is also presented in the media. For example, in the film 'Its a boygirl thing', the main female character, Nell, is polite, sensitive and well prepared to go to an academic university called Yale. Where as Woody, the main male character is rude and is going to join a mediocre university due to his football skills. This is a primary example of gender stereotype because yet again, females are being presented less powerful, sensitive and kind where as males are presented as rude, sporty and not as smart.