In movies a strong woman is manly. (big muscles, aggressive, punches people, etc.) Is that really the way it is?

I still don't get it. Are you asking if Sigourney Weaver in Alien is manly? If so, no

Sorry, genuinely trying to understand here. So are you saying "in movies, women who have strength of character are also shown as being 'manly' (big muscles, punches people, etc). Is that how it really is?"

If that's what you're asking, I don't think it's true. Some movies have women of very strong character, who are physically weak, pacifist, etc. And some movies have women that have strong characters and are physically strong, cabable of violence, etc. And some movies have women who are douchey, flawed characters who can be physically strong.

I'm not sure I see any correlation between strength of character and physical strength, or propensity to violence, for either men or women. It's more of a genre thing - in action movies men and women are more likely to be physically tough, and in political dramas they're more likely to be physically weak. And there will be a mix of people with "strong character" and people with flawed or weak characters.