Unfortunately my collection of Yueyun's pictures isn't large due to lack of material on the net. But this is probably the best picture I have of Yueyun when it comes to showing off her back. Her back looks like its sculptured from marble!!
Caucasian FBBs are usually larger and more muscular than Asians but Yueyun's back is so amazingly ripped that she can more than hold her own against Caucasian competitors.