Mountain Climbing
noun, する verb
You've hopefully seen how 登る means "to climb." So, if you're climbing a mountain what is that? It's mountain climbing.
やまのぼり
The reading comes from combining 山 and 登る together to form one word, 山登り. If you know the readings of those two words you know the reading of this word too.
山登りがしゅ味なんですか？
Is mountain climbing your hobby?
ものしずかな友人と、山登りに行ってきました。
I went to climb a mountain with my quiet friend.
お互い色々あったんだけど、山登りをしながらじっくり話し合ってさ。なんと復縁することになったよ。
Both of us have been through a lot, but we had a long talk while climbing a mountain and decided to get back together.