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1.ItisreportedthatthehealthofyoungpeopleinChina,collegestudentsinparticular,isnotasgoodasissupposedtobe.Therearemanyreasonsforthisfact,butthemainreasonisthatmanypeopleignoretheimportanceofphysicalexercises.Why,then,arephysicalexercisessoimportanttoourhealth?First,physicalexercisescanimprovebloodcirculation,speedingupthesupplyofnutrientsandoxygentoeverypartofthebodyandtheremovalofwastefromthebloodthroughsweatingandexhalation.Secondly,physicalexercisescanpromoteahealthymetabolism.Ithelpswiththedigestionandabsorptionoffood,thusgivingeveryoneagoodappetite.Thirdly,physicalexercisecanhelpconsumeexcessivefatinthebody,preventingpeoplefromputtingontoomuchweight,thuskeepingthemingoodshape.Finally,afterphysicalexercisesweusuallyneedagoodrestandasoundsleepatnight,refreshingusforthenextday＇swork.Inconclusion,physicalexercisesnoton[ykeepusfitandstrong,butalsohelpustobesuccessfulinourlives.Itis,therefore,stronglysuggestedthatyoungpeoplesparesometimetotakeanactivepartinvariouskindsofphysicalexercises.2.TheImportanceofPhysicalExerciseEveryonehopestolivehappilyintheworld.Physicalexerciseisindispensabletoahappylife.Thereisafamoussaying:Lifeliesonexercise.Althoughyouwillnotnecessarilydiewithoutregularphysicalexercises，they'IIcertainlyhelpyoulivelongerandmorehealthily.Exerciseisgoodforustobuildourbodies.Ithelpsco-ordinatethedifferentpartsofourbodieswhenwehavesports.Forexample，wemusttryourbesttoco-ordinatethemovementsofthearmsandlegswhenweplaybasketball，orwewon'tbeabletoshootthebasket.Exercisealsobenefitsourorgans.Itletstheheartbeatfasterthanusual，andthenhelpsenlargethebloodvesselstoprotectusfromheartattacks.Exercisecanalsocontributetothedevelopmentofourabilitytoresponseagilely.Forinstance，whenyouplaytable-tennis，youmusttrytoreflectasquicklyasyoucansothatyoumayfightbackattherightpositionatthefightmoment.Exercisecanalsocontributetoimprovingourmood.Whenyoudoexercise，youmovealot，andyouhavetobemoreactive.Ithelpsyoubecomemoreoptimistic.Exercisewillfillyourlifewithvariouscontentsandmakeitmorecolorful.What'smore，exercisewillhelpyougetridofyourinertia.Ifyoukeepdoingexerciseregularly，youwillneverbealazyperson.Therefore，exercisehasgreateffectonone'scharacter.Inaword，exerciseishelpful，importantandabsolutelynecessary3.Studentsinourschoolhaveonethingincommon-aninterestinsports.Accordingtotheirdifferentintentionsintakingpartinsports,theyfallintothreegroups.Manystudentsgototheplaygroundwhentheytiredafterafewhoursofstudy,Thesestudentsputmuchmoretressontheirstudyefficiencythanthefunofsports,Theyjustwanttogobacktotheirclassroomsfromtheplaygroundwithaclearerandquickermind.Thustheydon'tactuallycarewhethertheycanenjoythemselvesontheplayground.Mostofthemchooselongdistancerunning,thekindofexercisewhichfewrealsportsenthusiastslike.Sothisgroupofstudentscanbewelllabeledasstudy--orientedparticipation.Studentsthatmakeupthesecondgrouparerealsportslovers.Sometimestheyevenputasidetheirstudiesforamatch.Theytakepartinthesportthatintereststhemmost,notcaringwhetheritismostbeneficialtotheirhealth.Theymaybecalledfun-orientedsportsparticipants.Thethirdgroupwantbeautyfromsports.Boyswanttobecomestrong;girlswanttobeslimandgraceful.Thosewhoconsidersportstheonlywayofreducingweightalsobelongtothisgroup.Theyareverycarefulinchoosingthekindofexercisetheydo,andareafraidthatcertainsportsmayruintheirfigures.Horizontalbarsandparallelbarsaretheboy'schoice,andthehulahoopisnowthegirls'favorite.Theappropriatenameforthisgroupmaybebeauty-orientedsportsparticipants.Nomatterwhichgroupwebelongto,weallbenefitfromsports.Ifyoulookaroundthecampus,youwillfindthatbookwormshavedisappeared,and,instead,therearehealthy,strong,clever,modernizedstudentseverywhere.