If you are in the friend zone, then it means she doesn't find you attractive. Usually people get into habits, and their view of you isn't going to change a great deal over time. Which is why people get stuck in that zone.

Now if you always wear baggy clothing and it hid the fact you were extremely ripped and buff, and you take her swimming and she suddenly sees that, you will naturally spring free of the friend zone with no trouble. Realistically however, there probably wont be any major moments that suddenly make you appear more attractive(though if you save her from a burning building you are in). So the main way of getting out, is to flirt more, drop hints about your sexuality, and stuff like that.

This isn't an issue for woman, since normally if a woman dressed up, a man will find them attractive. Though if you are a girl who doesn't dress up that often, and you don't flirt much, you can end up in the friend zone of a guy too.