▁profession als ▁only . ▁When ▁the ▁sk ier ▁is ▁ready ▁( us ually ▁acknowled ged ▁by ▁them ▁y elling ▁" hit ▁it "), ▁the ▁driver ▁acceler ates ▁the ▁boat . ▁As ▁the ▁boat ▁acceler ates ▁and ▁takes ▁up ▁the ▁s lack ▁on ▁the ▁ro pe , ▁the ▁sk ier ▁allows ▁the ▁boat ▁to ▁pull ▁them ▁out ▁of ▁the ▁water ▁by ▁applying ▁some ▁mus cle ▁strength ▁to ▁get ▁into ▁an ▁u pr ight ▁body ▁position . ▁ ▁By ▁lean ing ▁back ▁and ▁keeping ▁the ▁legs ▁slightly ▁bent , ▁the ▁sk is ▁will ▁eventually ▁plane ▁out ▁and ▁the ▁sk ier ▁will ▁start ▁to ▁gli de ▁over ▁the ▁water . ▁The ▁sk ier ▁turns ▁by ▁sh ifting ▁weight ▁left ▁or ▁right . ▁The ▁sk ier ' s ▁body ▁weight ▁should ▁be ▁bal anced ▁between ▁the ▁balls ▁of ▁the ▁feet ▁and ▁the ▁he els . ▁While ▁being ▁to wed , ▁the ▁sk ier ' s ▁arms ▁should ▁be ▁relax ed ▁but ▁still ▁fully ▁extended ▁so ▁as ▁to ▁reduce ▁stress ▁on ▁the ▁arms . ▁The ▁handle ▁can ▁be ▁held ▁vert ically ▁or ▁hor izont ally , ▁depending ▁on ▁wh iche ver ▁position ▁is ▁more ▁comfortable ▁for ▁the ▁sk ier . ▁ ▁In ▁addition ▁to ▁the ▁driver ▁and ▁the ▁sk ier , ▁a ▁third ▁person ▁known ▁as ▁the ▁spot ter ▁or ▁the ▁observer ▁should ▁be ▁present . ▁The ▁spot ter ' s ▁job ▁is ▁to ▁watch ▁the ▁sk ier ▁and ▁inform ▁the ▁driver ▁if ▁the ▁sk ier ▁falls . ▁The ▁spot ter ▁usually ▁s its ▁in ▁a ▁chair ▁on