我没觉得，就是向后弯曲下腰比较努力，小时能做到。我学过的那首Im urs的歌第三段歌词就用到这个idiom

当时还没明白，向后弯腰照镜子怎么看更清楚？

而且这是reggae, 强拍在后

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