That depends on which type of stretching you would be doing. Some stretches you could do for a long time and gain strength others not so much. explain further please
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Drug Use and Viral Infections (HIV, Hepatitis)
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blood transfusion cancer cells killed radiation therapy → bone marrow grows
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where is the question at?
Science must be used to figure out the correct weight, length, and what material it is made out of to be the most successful at its job. Technology must be used to make sure that the calculations are correct and to use a 3d printer or something like that to make it, that or robots/tools.