▁leg ▁( It ▁was ▁only ▁four ▁years ▁later ▁that ▁S acks ▁was ▁put ▁through ▁n erve ▁condu ction ▁tests ▁to ▁better ▁understand ▁the ▁sever ity ▁of ▁the ▁n erve ▁damage ). ▁Oliver ▁S acks ▁then ▁graduated ▁from ▁the ▁con val esc ence ▁home ▁and ▁found ▁himself ▁in ▁the ▁office ▁of ▁Mr . ▁W . R . ▁of ▁Har ley ▁Street . ▁ ▁Mr . ▁W . R . ▁asked ▁S acks ▁what ▁he ▁enjoyed ▁doing ▁most ▁before ▁the ▁incident . ▁ ▁When ▁S acks ▁respond ed ▁with ▁sw imming , ▁Mr . ▁W . R . ▁called ▁up ▁a ▁lif egu ard ▁and ▁sent ▁S acks ▁on ▁his ▁way ▁to ▁a ▁local ▁pool . ▁ ▁Upon ▁arriv ing , ▁the ▁lif egu ard ▁pushed ▁S acks ▁into ▁the ▁pool ▁( on ▁Mr . ▁W . R .' s ▁directions ) ▁despite ▁his ▁protest s . ▁ ▁Fe eling ▁out rag ed ▁and ▁challeng ed , ▁S acks ▁began ▁to ▁sw im ▁without ▁any ▁regard ▁to ▁dis ability ▁until ▁the ▁lif egu ard ▁told ▁him ▁he ▁was ▁finished . ▁ ▁Without ▁any ▁thought , ▁S acks ▁got ▁out ▁of ▁the ▁pool ▁and ▁began ▁to ▁walk ▁around ▁normally ▁despite ▁the ▁notion ▁that ▁his ▁left ▁leg ▁was ▁still ▁lim p . ▁ ▁S acks ▁was ▁left ▁aston ished ▁by ▁Mr . ▁W . R .' s ▁simple ▁and ▁effective ▁solution ▁to ▁being ▁in cap able ▁of ▁physical ▁activity : ▁" conde lect ari ▁sib i ." ▁ ▁The ▁next ▁morning , ▁S acks ▁received ▁a ▁letter