It is true that training in combat sports (mma, freestyle wrestling, boxing) do change the way you react to punches being thrown at you. I grew up freestyle wrestling and boxing and I react differently in a fight than my buddy would who has not been trained.
It is hard to explain but it is almost like your muscle memory is so good that you can block anything coming at you and stay calm to pick your shots. I think the ability to control your adrenaline in a physical confrontation is key since your able to keep a calm head and see things clearly where as someone who has not had the experience/training will go into almost a blind rage and leave themselves wide open to be 1 punched.
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