3 ) ▁performed ▁a ▁meta - analysis ▁that ▁looked ▁at ▁the ▁relationship ▁between ▁physical ▁activity ▁and ▁cogn itive ▁performance ▁in ▁children . ▁They ▁reported ▁a ▁benef icial ▁relationship ▁in ▁the ▁categories ▁of ▁per cept ual ▁skills , ▁intelligence ▁quot ient , ▁achiev ement , ▁ver bal ▁tests , ▁math ematic ▁tests , ▁development al ▁level / ac ade mic ▁read iness ▁and ▁other , ▁with ▁the ▁exception ▁of ▁memory , ▁that ▁was ▁found ▁to ▁be ▁un related ▁to ▁physical ▁activity . ▁The ▁correlation ▁was ▁strong est ▁for ▁the ▁age ▁ranges ▁of ▁ 4 – 7 ▁and ▁ 1 1 – 1 3 ▁years . ▁On ▁the ▁other ▁hand , ▁Ch add ock ▁and ▁colle agues ▁( 2 0 1 1 ) ▁found ▁results ▁that ▁contrast ed ▁S ible y ▁and ▁E tn ier ' s ▁meta - analysis . ▁In ▁their ▁study , ▁the ▁hypothesis ▁was ▁that ▁lower - fit ▁children ▁would ▁perform ▁poor ly ▁in ▁executive ▁control ▁of ▁memory ▁and ▁have ▁smaller ▁hi pp oc amp al ▁volumes ▁compared ▁to ▁higher - fit ▁children . ▁Instead ▁of ▁physical ▁activity ▁being ▁un related ▁to ▁memory ▁in ▁children ▁between ▁ 4 ▁and ▁ 1 8 ▁years ▁of ▁age , ▁it ▁may ▁be ▁that ▁pre ad oles c ents ▁of ▁higher ▁fit ness ▁have ▁larger ▁hi pp oc amp al ▁volumes , ▁than ▁pre ad oles c ents ▁of ▁lower ▁fit ness . ▁According ▁to ▁a ▁previous ▁study ▁done ▁by ▁Ch add ock ▁and ▁colle agues ▁( Ch add ock ▁et ▁al . ▁ 2