Joana Heidrich (Swiss Volleyball Player)

[feverpitch]

This volleyball player has one of the leanest spines I've ever seen!

[grubnugget]

That definition...

Found some higher quality versions:



Less cropped version:
 


And some others with less shadow but you can still see how defined her spine is:





In this one, her lower back really looks like it bulges out more than normal. Maybe that has something to do with that definition. Either way she's got an amazing spine!