What are the main muscles used in punching?

Question

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Answer 1

well I have been doing boxing for the last two years. I found that the pectoral muscles( the chest muscles) are the major muscles used in punching.

Answer 2

Shoulders and arms.  But the power comes all the way down from your legs.  If you look at Tyson's body, you'd find very thick and strong legs.  That's where all his power come from.