conventional wisdom would hold that it's generally a bad idea to hit yourself in the head with a metal bar. i don't know how hard you can hit before it causes brain damage, and i don't know if hitting a bone actually makes the bone stronger. i know calcium and exercise do.
if you've got the leverage you can move just about anything, including a tai chi master. they're masters because they can deprive you of the proper leverage, but that involves moving themselves. demonstrations of immovability generally involve someone applying force in a very inefficient way (lifting from under the arms, for instance), and the master simply sinking his weight or making one or two similar adjustments to create the shocking effect of not being moved.
if you're ever involved in one of these demonstrations, ask the master if you may now try moving him by, say, a hip throw. chances are he won't allow you. also, half of the time when these things are demonstrated, they're demonstrated by the master's own students, and generally, the more "obedient" ones. this is a reason why controlled tests are better than MA demonstrations, when trying to figure out what someone can and can't really do.
oh, and your hands move air, which blows out candles. it does take real skill to be able to strike in such a way that you can move the air suddenly enough to do that. but it's still just air.
if you've got the leverage you can move just about anything, including a tai chi master. they're masters because they can deprive you of the proper leverage, but that involves moving themselves. demonstrations of immovability generally involve someone applying force in a very inefficient way (lifting from under the arms, for instance), and the master simply sinking his weight or making one or two similar adjustments to create the shocking effect of not being moved.
if you're ever involved in one of these demonstrations, ask the master if you may now try moving him by, say, a hip throw. chances are he won't allow you. also, half of the time when these things are demonstrated, they're demonstrated by the master's own students, and generally, the more "obedient" ones. this is a reason why controlled tests are better than MA demonstrations, when trying to figure out what someone can and can't really do.
oh, and your hands move air, which blows out candles. it does take real skill to be able to strike in such a way that you can move the air suddenly enough to do that. but it's still just air.
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