"Mountaineering" is the name of the sporting activity where people climb mountains. A "mountaineer" is someone who climbs mountains. When you are walking up a mountain, this is called "trekking".
The act of going up a mountain is called mountain climbing or hiking.
Walking up a mountain is usually called hiking, but the act of climbing up the rocks of a mountain and being balanced with a rope is usually called mountain climbing.
-My friends and I usually hike on Saturday.
-I would like to go mountain climbing one day.
山に登ることは、mountain climbingまたはhikingと言います。
山を歩いて登ることは普通、hikingと言いますが、山の岩を登ってロープでバランスを取ったりする場合は普通、mountain climbingと言います。
-My friends and I usually hike on Saturday.
友達と私は、普通土曜日にハイキングに行きます。
-I would like to go mountain climbing one day.
いつか登山に行きたいです。
"Mountain climbing" is using your whole body to physically climb up the side of the mountain. "Trekking" on the other hand is hard/difficult hiking up and around the mountain, sometimes to the peak.
The act of climbing a mountain is mainly called 'mountaineering', but, it is also commonly called mountain climbing'. 'Mountain climbing' is often dangerous if the mountain has a lot of snow on it. Avalanches often occur and they can sweep and bury mountain climbers. Before climbing a mountain, it's important to find out if dangers such as this do exist on the mountain before starting on the journey so that a person can be better prepared.
So, you may say:
We will be going mountain climbing this summer.
or
I am now so used to mountaineering that it does not scare me anymore.
登山することを”Mountaineering"と言いますが、一般的には”Mountain climbing"（山登り）と言います。
雪が積もっている山を登るのはリスクが高いですね。雪なだれが起きれば、登山者は流され埋もれてしまいます。山を登る前に、このような事態に巻き込まれないよう、事前知識や準備をすることが重要です。
We will be going mountain-climbing this summer.
（この夏、山登りをします。）
I am now so used to mountaineering that it does not scare me anymore.
（登山にはすっかり慣れているので、もう怖さは感じません。）
The two sentences you see above are great ways to express that you enjoy climbing mountains. The words hike and trek both mean to make a long, somewhat difficult journey on foot. These are words that would make great additions to your vocabulary, especially if you enjoy hiking or trekking a lot! I hope these two sentences and this explanation help you out.
Mountain climbing is the name given to the act of climbing mountains. When a person descends down a mountain and specifically has to make their way down a cliff side using ropes and pulleys, this is then called abseiling.
山を登ること「登山」は英語で「mountain climbing」といいます。
だから、登山を仕事にしている人「登山家」は「mountain climber」と呼びます。
例文：
「私の趣味は登山です」
→「My hobby is mountain climbing」
「私の弟は登山家になりたいと言いました」
→「My younger brother said that he wants to be a mountain climber」
ご参考になれば幸いです。
「登山」はmountain climbingと言います(*^_^*)
また、それより軽い感じで、山道や田舎道を楽しく歩くことはhikingと言います(*^_^*)
以上ですm(_)m
少しでも参考になれば幸いです(#^^#)
お困りの時は、いつでも気軽にご質問ください(^0^)/
★★どうぞよろしくお願いもうしあげます★★
see you soon♪
ブルガリア 
オーストラリア 
南アフリカ 
アメリカ合衆国 
イギリス 
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