1 9 4 5 ▁Category : Pol it ics ▁of ▁the ▁London ▁Bor ough ▁of ▁H arrow <0x0A> </s> ▁Water ▁ski ing ▁( also ▁waters ki ing ▁or ▁water - ski ing ) ▁is ▁a ▁surface ▁water ▁sport ▁in ▁which ▁an ▁individual ▁is ▁pulled ▁behind ▁a ▁boat ▁or ▁a ▁cable ▁ski ▁installation ▁over ▁a ▁body ▁of ▁water , ▁sk imming ▁the ▁surface ▁on ▁two ▁sk is ▁or ▁one ▁ski . ▁The ▁sport ▁requires ▁sufficient ▁area ▁on ▁a ▁smooth ▁stretch ▁of ▁water , ▁one ▁or ▁two ▁sk is , ▁a ▁to w ▁boat ▁with ▁to w ▁ro pe , ▁three ▁people ▁( dep ending ▁on ▁state ▁bo ating ▁laws ), ▁and ▁a ▁personal ▁fl ot ation ▁device . ▁In ▁addition , ▁the ▁sk ier ▁must ▁have ▁ade qu ate ▁upper ▁and ▁lower ▁body ▁strength , ▁mus cular ▁end urance , ▁and ▁good ▁balance . ▁ ▁There ▁are ▁water ▁ski ▁participants ▁around ▁the ▁world , ▁in ▁Asia ▁and ▁Australia , ▁Europe , ▁Africa , ▁and ▁the ▁Amer icas . ▁In ▁the ▁United ▁States ▁alone , ▁there ▁are ▁approximately ▁ 1 1 ▁million ▁water ▁ski ers ▁and ▁over ▁ 9 0 0 ▁san ction ed ▁water ▁ski ▁compet itions ▁every ▁year . ▁Australia ▁bo asts ▁ 1 . 3 ▁million ▁water ▁ski ers . ▁ ▁There ▁are ▁many ▁options ▁for ▁recre ational ▁or ▁compet itive ▁water ▁ski ers . ▁These ▁include ▁speed ▁ski ing , ▁trick ▁ski ing , ▁show ▁ski ing , ▁sl alom ing , ▁jump ing , ▁bare foot ▁ski ing ▁and ▁w