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极限运动Introduction•Anextremesportisapopulartermforcertainactivitiesperceivedashavingahighlevelofinherentdanger.•Theseactivitiesofteninvolvespeed，height，highlevelofphysicalexertion，andhighlyspecializedgearorspectacularstunts.Parkour•Parkour(sometimesabbreviatedtoPK)isanactivitywiththeaimofmovingfromonepointtoanotherasefficientlyandquicklyaspossible,usingprincipallytheabilitiesofthehumanbody.Itismeanttohelponeovercomeobstacles,whichcanbeanythinginthesurroundingenvironment—frombranchesandrockstorailsandconcretewalls—andcanbepracticedinbothruralandurbanareas.Maleparkourpractitionersarerecognizedastraceursandfemaleastraceuses.跑酷（可以简化为pk）是一项以尽可能快和有效地从一个地点移动到另一个地点为目的的一项运动，主要是通过人的身体的能力来达到这一目的。这就意味着要以身体来克服任何环境中的障碍，例如篱笆、岩石、栏杆或是墙壁。这项运动可以再郊区或者是城市开展。男性跑酷练习者叫做traceurs女性叫traceusesExtremeskydivingOnceonlyusedforemergencyuseandmilitaryoperations，skydivinghascomealongway.Ithasattractedmanyadventureseekersandhasevenbecomeasport.However，skydivingisnotforthefaint-hearted,andthosewhohavethegutstodoitdosoattheirownrisk.高空跳伞曾经一度只用于紧急装况及军事行动中，但它现在可是今昔非比。高空跳伞吸引了许多冒险追求者的参与，甚至进而成为一项运动。然而高空跳伞可不适合天生胆小的人，而那些有胆挑战的人，则是要承担起所有风险。Bungeejumping•Bungeejumpingisanactivitythatinvolvesjumpingfromatallstructurewhileconnectedtoalargeelasticcord.Thetallstructureisusuallyafixedobject,suchasabuilding,bridgeorcrane;butitisalsopossibletojumpfromamovableobject,suchasahot-air-balloonorhelicopter,thathastheabilitytohoverabovetheground.Thethrillcomesasmuchfromthefree-fallingasfromtherebounds.Surfing•Surfingisthetermisusedforasurfacewatersportinwhichthepersonsurfingmovesalongthefaceofabreakingoceanwave(thesurf).However,surfingisnotrestrictedtosaltwater,butcansometimestakeplaceonrivers,usingastandingwave.Themainuseofthewordsurfingisforridingwavesusingaboardonwhichthesurferstands.Otherformsincludebodyboarding,inwhichtheindividualridingthewaveonlypartlyraiseshisupperbodyfromtheboardsurface,andfrombodysurfing,wherenoboardatallisused.