去 + 登山 / 登山 + 者
登山 (dēngshān) means 'to climb a mountain' or 'mountaineering.' It is a verb-object compound that can function as both a verb and a noun, used for casual hiking as well as serious alpine climbing.
我们周末打算去登山,你要一起来吗?
Wǒmen zhōumò dǎsuàn qù dēngshān, nǐ yào yīqǐ lái ma?
We plan to go mountain climbing this weekend, do you want to come along?
登山之前一定要检查好装备。
Dēngshān zhīqián yīdìng yào jiǎnchá hǎo zhuāngbèi.
You must check your equipment before climbing a mountain.
他每年夏天都去登山锻炼身体。
Tā měi nián xiàtiān dōu qù dēngshān duànliàn shēntǐ.
He goes mountain climbing every summer to exercise.