是定语从句。

Young men, you three are all usually strong and resourceful, so I'd like you to strive to climbing that high mountain we have always been worshiping as a sacred place.

【翻译】年轻人，你们三个通常都很强壮，足智多谋，所以我希望你们努力攀登我们一直崇拜的那座作为圣地的高山。

【句子成分直观分析】

Young men（主语）, you three（同位语） are all usually strong and resourceful（系表）, so（引导并列分句） I'd like （主谓）you （宾语）to strive to climbing that high mountain （宾补：由不定式构成）we have always been worshiping as a sacred place.（定语从句)