The main reason you tense at the end of a punch is to avoid injuring the hand and wrist. If you were to keep everything completely relaxed even during contact, you would break bones (particularly in the wrist).
As for Serge's concept of twisting ... the twist helps to generate and translate the power better through the arm. Almost gives a whipping motion to the punch.
As for Serge's concept of twisting ... the twist helps to generate and translate the power better through the arm. Almost gives a whipping motion to the punch.
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