I see what your saying and i see what people are trying to emulate while doing this however i just think its not the best of ways to do things in boxing, listen to scrap and you will be doing yourself a favour. elastic isnt going to cause the same overly tense guard as weights because the resistance isnt there until its activated by your movements either by a punch or defencive manouver or a simple guard/muffs on.
also with the weights as you build momentum throughout the shot it no longer requires much intense contraction throughout the movement as momentum of the weight builds, whereas elastic will add resistance as the punch develops which is one of the oldest strength building principles right there so that must be a nice added benefit.
Not to mention its going to have you boxing from a slightly different stance than usual as youve drastically changed your centre of gravity by having big weights in your hands so your probably going to be well off balance, it seems to me your guaranteed to end up leaning/reaching on the front foot unless you have overly good posture. in time both these bad habits caused through the training and the effect of the training method itself will start costing you speed rather than developing it. doesnt sound like good speed training to me, doesnt sound like good anything training really.
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