There&#x27;s also that study where kids trying to throw a ball into a basket from a specific distance improved quicker if they practiced throwing from two different distances, different from the one that was tested, than those practicing only the tested distance.<p>Edit: I think this is it: <a href="http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pubmed&#x2F;662537" rel="nofollow">http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pubmed&#x2F;662537</a>