我沒覺得，就是向後彎曲下腰比較努力，小時能做到。我學過的那首Im urs的歌第三段歌詞就用到這個idiom

當時還沒明白，向後彎腰照鏡子怎麽看更清楚？

而且這是reggae, 強拍在後

https://bbs.wenxuecity.com/ktv/2748692.html

whoa-whoa-whoa
Uh-huh, mmm-hmm
 
I've been spending way too long checking my tongue in the mirror
And bending over backwards just to try to see it clearer
But my breath fogged up the glass
And so I drew a new face and I laughed
I guess what I be saying is there ain't no better reason
To rid yourself of vanities and just go with the seasons
It's what we aim to do
Our name is our virtue