Bottom line , unless your Superman , no matter how good shape your in or how muscled up you are …you can be killed , and frighteningly fast . a stray or purposeful bullet , or a knife thrust into your gut when you are not expecting it , because you took the wrong person lightly or underestimated a person , thinking them easy mark . Think about how many ****** punches land …then think about it being a knife instead of a fist . Yes be in shape , but your mind and judgement will serve you better and keep you alive longer . Remember also that there are pistols designed for this purpose , very small and easily hid ….that can be good or bad .