What are the physical requirements for Langtang Valley Trek?

Select Your CountryUnited StatesCanadaMexicoUnited KingdomAfghanistanAlbaniaAlgeriaAmerican SamoaAndorraAngolaAnguillaAntigua and BarbudaArgentinaArmeniaArmeniaArubaAustraliaAustriaAzerbaijanAzerbaijanBahamasBahrainBangladeshBarbadosBelarusBelgiumBelizeBeninBermudaBhutanBoliviaBonaireBosnia and HerzegovinaBotswanaBouvet Island (Bouvetoya)BrazilBritish Indian Ocean Territory (Chagos Archipelago)British Virgin IslandsBrunei DarussalamBulgariaBurkina FasoBurundiCambodiaCameroonCape VerdeCayman IslandsCentral African RepublicChadChileChinaChristmas IslandCocos (Keeling) IslandsColombiaComorosCongoCongoCook IslandsCosta RicaCote d'IvoireCroatiaCubaCuraçaoCyprusCyprusCzech RepublicDenmarkDjiboutiDominicaDominican RepublicEcuadorEgyptEl SalvadorEquatorial GuineaEritreaEstoniaEthiopiaFalkland Islands (Malvinas)Faroe IslandsFijiFinlandFranceFrench GuianaFrench PolynesiaFrench Southern TerritoriesGabonGambiaGeorgiaGermanyGhanaGibraltarGreeceGreenlandGrenadaGuadeloupeGuamGuatemalaGuernseyGuineaGuinea-BissauGuyanaHaitiHeard Island and McDonald IslandsHoly See (Vatican City State)HondurasHong KongHungaryIcelandIndiaIndonesiaIranIraqIrelandIsle of ManIsraelItalyJamaicaJapanJerseyJordanKazakhstanKazakhstanKenyaKiribatiKoreaKoreaKuwaitKyrgyz RepublicLao People's Democratic RepublicLatviaLebanonLesothoLiberiaLibyan Arab JamahiriyaLiechtensteinLithuaniaLuxembourgMacaoMacedoniaMadagascarMalawiMalaysiaMaldivesMaliMaltaMarshall IslandsMartiniqueMauritaniaMauritiusMayotteMicronesiaMoldovaMonacoMongoliaMontenegroMontserratMoroccoMozambiqueMyanmarNamibiaNauruNepalNetherlandsNetherlands AntillesNew CaledoniaNew ZealandNicaraguaNigerNigeriaNiueNorfolk IslandNorthern Mariana IslandsNorwayOmanPakistanPalauPalestinian TerritoryPanamaPapua New GuineaParaguayPeruPhilippinesPitcairn IslandsPolandPortugalPuerto RicoQatarReunionRomaniaRussian FederationRwandaSaint BarthelemySaint HelenaSaint Kitts and NevisSaint LuciaSaint MartinSaint Pierre and MiquelonSaint Vincent and the GrenadinesSamoaSan MarinoSao Tome and PrincipeSaudi ArabiaSenegalSerbiaSeychellesSierra LeoneSingaporeSint Maarten (Netherlands)Slovakia (Slovak Republic)SloveniaSolomon IslandsSomaliaSouth AfricaSouth Georgia & S. Sandwich IslandsSpainSri LankaSudanSurinameSvalbard & Jan Mayen IslandsSwazilandSwedenSwitzerlandSyrian Arab RepublicTaiwanTajikistanTanzaniaThailandTimor-LesteTogoTokelauTongaTrinidad and TobagoTunisiaTurkeyTurkeyTurkmenistanTurks and Caicos IslandsTuvaluU.S. Virgin IslandsU.S. Minor Outlying IslandsUgandaUkraineUnited Arab EmiratesUruguayUzbekistanVanuatuVenezuelaVietnamWallis and FutunaWestern SaharaYemenZambiaZimbabwe