ing ▁is ▁often ▁related ▁to ▁show ▁ski ing . ▁The ▁goal ▁is ▁to ▁go ▁off ▁the ▁jump , ▁perform ▁one ▁of ▁many ▁st un ts , ▁and ▁successfully ▁land ▁back ▁on ▁the ▁water . ▁The ▁most ▁common ▁fre est yle ▁st un ts ▁– ▁in ▁order ▁of ▁usual ▁pro gression ▁– ▁would ▁be ▁a ▁hel i ▁( 3 6 0 ° ), ▁a ▁f lip ▁( for wards ), ▁a ▁g ainer ▁( a ▁back ▁f lip ), ▁and ▁a ▁m ö b ius ▁( back ▁f lip ▁with ▁ 3 6 0 ° ). ▁ ▁Ski ▁racing ▁Water ▁ski ▁racing ▁consists ▁of ▁ 1 ▁or ▁ 2 ▁ski ers ▁per ▁boat ▁who ▁race ▁around ▁a ▁set ▁course ▁behind ▁boats ▁set ▁up ▁for ▁this ▁type ▁of ▁event . ▁It ▁can ▁occur ▁in ▁a ▁' circle ' ▁or ▁lap ▁format ▁type ▁racing ▁- ▁which ▁is ▁the ▁format ▁used ▁for ▁world ▁championship ▁events , ▁held ▁ever ▁four ▁years , ▁or ▁on ▁river ▁courses ▁offering ▁longer ▁distances ▁and ▁higher ▁spe eds . ▁R aces ▁can ▁be ▁tim ed ▁events ▁such ▁as ▁ 2 0 ▁minute ▁races ▁and ▁up ▁to ▁ 1 ▁hour ▁or ▁on ▁courses ▁where ▁race ▁distance ▁can ▁be ▁over ▁ 1 0 0   km ▁in ▁length . ▁ ▁Spe eds ▁vary ▁by ▁classes ▁but ▁can ▁reach ▁up ▁to ▁ 2 0 0   km / h . ▁Bo ats ▁can ▁be ▁in boards ▁or ▁out boards ▁and ▁are ▁generally ▁between ▁ 1 9 ▁and ▁ 2 1 ▁feet ▁in ▁length . ▁Out boards