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im assuming that you never took an engineering course because this would be covered in Engineering 101.
it would be efficiency. someone would have worked out that the weight with the handle at that length would be the most efficient for most people to use.
ill try and explain it in simple terms.
hold a 20kg weight to your chest.
now hold that 20kg weight with outstretched arms.
which is harder to do? obviously the one with the outstretched arms, right?
now try it by holding a 2m plank and with the 20kg weight at the end of it. you're most probably not going to be able to hold it up.
ill probably let someone like TK or BadNick explain the engineering aspect of it,but in simple terms the formula is:
Force x length
the shorter the length the less the moment. the longer the length the greater the moment and the harder to hold it up.
hope this helps...now ill let the real engineers explain it!
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