How should your fist make contact on an opponent? fighting? why?

Question by Jack S: How should your fist make contact on an opponent? fighting? why?
When I punch I feel most comfortable punching with my fist making contact and the knuckles facing sideways. I’ve noticed that most movies and clips I find online have people punching and their knuckles facing upwards. Which way is best and why?

Thanks in advance.

Best answer:

Answer by mental!anarchy!
depends but usually you want to put a rotation intoo it and then use only your first 203 knuckles.

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