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Of course you're right Lance is an extreme example, but if you look at any pro peloton there are always riders with that 'hunchback' look, despite the fact they've all received many hours of fitting. It's just natural for some people regardless of how well fitted they are. Also most of them will have a curved rather than straight back.
I agree thrasher's position in that video doesn't look like it's quite refined enough, and maybe not all that comfortable. I'm not a bike fitter but to me it looks like he's got too much upper body movement, overly rounded back and is perhaps too stretched out. But all I meant was that not everyone needs to aim for the completely straight-backed, upright position in the earlier photo.
Rudder2-
but if you look at any pro peloton there are always riders with that 'hunchback' look, despite the fact they've all received many hours of fitting.
I'm pretty sure most of the pro's who look like that are the ones are too ornery to change, having ridden like that since they were teens.
They also have a full support team to loosen them up after every (serious) ride, which also negates some of the fit issues that would plague a normal cyclist
branwen
Lance was a wrongun his bike set up (hood position for example) was horrible.
There does not appear to be a great saddle to bar drop.